UndefRefError: access to undefined reference

[tk3369]

Nice package, Mike! I found this obscure error message when saving this custom AbstractArray type from SASLib.jl.

julia> using SASLib

julia> p = SASLib.ObjectPool{String,UInt8}("", 3)
3-element SASLib.ObjectPool{String,UInt8}:
 ""
 ""
 ""

julia> BSON.@save "test.bson" p
ERROR: UndefRefError: access to undefined reference
Stacktrace:
 [1] lower(::Array{String,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/extensions.jl:60
 [2] _lower_recursive(::Array{String,1}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [3] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/BSON.jl:25
 [4] _lower_recursive(::Array{Any,1}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [5] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/tomkwong/.julia/v0.6/BSON/src/BSON.jl:18
 [6] _lower_recursive(::Dict{String,UInt8}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [7] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/BSON.jl:25
 [8] _lower_recursive(::Array{Any,1}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [9] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/tomkwong/.julia/v0.6/BSON/src/BSON.jl:18
 [10] _lower_recursive(::SASLib.ObjectPool{String,UInt8}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [11] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/tomkwong/.julia/v0.6/BSON/src/BSON.jl:18
 [12] _lower_recursive(::Dict{Symbol,SASLib.ObjectPool{String,UInt8}}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [13] lower_recursive(::Dict{Symbol,SASLib.ObjectPool{String,UInt8}}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:73
 [14] open(::BSON.##16#17{Dict{Symbol,SASLib.ObjectPool{String,UInt8}}}, ::String, ::String) at ./iostream.jl:152
 [15] bson(::String, ::Dict{Symbol,SASLib.ObjectPool{String,UInt8}}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:83

[MikeInnes]

Any chance you can narrow this down a bit? If you can figure out the minimal type definition that triggers this, it should be easy to fix.

[tk3369]

Looks like it fails for all Dict with non-symbol keys:

julia> c4 = Dict("a" => :b)
Dict{String,Symbol} with 1 entry:
  "a" => :b

julia> BSON.@save "test.bson" c4
ERROR: UndefRefError: access to undefined reference
Stacktrace:
 [1] lower(::Array{String,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/extensions.jl:60
 [2] _lower_recursive(::Array{String,1}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [3] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/BSON.jl:25
 [4] _lower_recursive(::Array{Any,1}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [5] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/tomkwong/.julia/v0.6/BSON/src/BSON.jl:18
 [6] _lower_recursive(::Dict{String,Symbol}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [7] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/tomkwong/.julia/v0.6/BSON/src/BSON.jl:18
 [8] _lower_recursive(::Dict{Symbol,Dict{String,Symbol}}, ::ObjectIdDict, ::Array{Any,1}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:62
 [9] lower_recursive(::Dict{Symbol,Dict{String,Symbol}}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:73
 [10] open(::BSON.##16#17{Dict{Symbol,Dict{String,Symbol}}}, ::String, ::String) at ./iostream.jl:152
 [11] bson(::String, ::Dict{Symbol,Dict{String,Symbol}}) at /Users/tomkwong/.julia/v0.6/BSON/src/write.jl:83

julia> c4 = Dict("a" => 1)
Dict{String,Int64} with 1 entry:
  "a" => 1

julia> BSON.@save "test.bson" c4
ERROR: UndefRefError: access to undefined reference

julia> c4 = Dict(1 => "a")
Dict{Int64,String} with 1 entry:
  1 => "a"

julia> BSON.@save "test.bson" c4
ERROR: UndefRefError: access to undefined reference

[DilumAluthge]

This is really interesting. It doesn't fail for all non-symbol keys; for example, it works for integer keys/integer values.

Key type	Value type	Does it work?
Symbol	Symbol	Yes
Symbol	String	Yes
Symbol	Int64	Yes
String	Symbol	No
String	String	No
String	Int64	No
Int64	Symbol	No
Int64	String	No
Int64	Int64	Yes

julia> x1 = Dict(:a => :a); BSON.@save "test.bson" x1

julia> x2= Dict(:a => "a"); BSON.@save "test.bson" x2

julia> x3= Dict(:a => 1); BSON.@save "test.bson" x3

julia> x4 = Dict("a" => :a); BSON.@save "test.bson" x4
ERROR: UndefRefError: access to undefined reference
Stacktrace:
 [1] lower(::Array{String,1}) at /Users/dilum/.julia/v0.6/BSON/src/extensions.jl:60
 [2] _lower_recursive(::Array{String,1}, ::ObjectIdDict, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:62
 [3] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/BSON.jl:25
 [4] _lower_recursive(::Array{Any,1}, ::ObjectIdDict, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:62
 [5] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/dilum/.julia/v0.6/BSON/src/BSON.jl:18
 [6] _lower_recursive(::Dict{String,Symbol}, ::ObjectIdDict, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:62
 [7] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/dilum/.julia/v0.6/BSON/src/BSON.jl:18
 [8] _lower_recursive(::Dict{Symbol,Dict{String,Symbol}}, ::ObjectIdDict, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:62
 [9] lower_recursive(::Dict{Symbol,Dict{String,Symbol}}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:73
 [10] open(::BSON.##16#17{Dict{Symbol,Dict{String,Symbol}}}, ::String, ::String) at ./iostream.jl:152
 [11] bson(::String, ::Dict{Symbol,Dict{String,Symbol}}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:83

julia> x5 = Dict("a" => "a"); BSON.@save "test.bson" x5
ERROR: UndefRefError: access to undefined reference
Stacktrace:

julia> x6 = Dict("a" => 1); BSON.@save "test.bson" x6
ERROR: UndefRefError: access to undefined reference
Stacktrace:

julia> x7 = Dict(1 => :a); BSON.@save "test.bson" x7
ERROR: UndefRefError: access to undefined reference
Stacktrace:

julia> x8 = Dict(1 => "a"); BSON.@save "test.bson" x8
ERROR: UndefRefError: access to undefined reference
Stacktrace:

julia> x9 = Dict(1 => 1); BSON.@save "test.bson" x9

julia>

[DilumAluthge]

This works:

julia> BSON.bson("test.bson", Dict(:a => 1, :b => Dict(:c => 3, :d => Dict(:e => 5) )  ))

julia>

And this works:

julia> BSON.bson("test.bson", Dict(:a => 1, :b => Dict(:c => 3, :d => Dict(5 => 5) )  ))

julia>

And this also works:

julia> BSON.bson("test.bson", Dict(:a => 1, :b => Dict(:c => 3, :d => Dict(1.23 => 5) )  ))

julia>

But this does NOT work:

julia> BSON.bson("test.bson", Dict(:a => 1, :b => Dict(:c => 3, :d => Dict("e" => 5) )  ))
ERROR: UndefRefError: access to undefined reference
Stacktrace:
 [1] lower(::Array{String,1}) at /Users/dilum/.julia/v0.6/BSON/src/extensions.jl:60
 [2] _lower_recursive(::Array{String,1}, ::ObjectIdDict, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:62
 [3] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/BSON.jl:25
 [4] _lower_recursive(::Array{Any,1}, ::ObjectIdDict, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:62
 [5] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/dilum/.julia/v0.6/BSON/src/BSON.jl:18
 [6] _lower_recursive(::Dict{String,Int64}, ::ObjectIdDict, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:62
 [7] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/dilum/.julia/v0.6/BSON/src/BSON.jl:18
 [8] _lower_recursive(::Dict{Symbol,Any}, ::ObjectIdDict, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:62
 [9] applychildren!(::BSON.##7#11{ObjectIdDict,Array{Any,1}}, ::Dict{Symbol,Any}) at /Users/dilum/.julia/v0.6/BSON/src/BSON.jl:18
 [10] _lower_recursive(::Dict{Symbol,Any}, ::ObjectIdDict, ::Array{Any,1}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:62
 [11] lower_recursive(::Dict{Symbol,Any}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:73
 [12] open(::BSON.##16#17{Dict{Symbol,Any}}, ::String, ::String) at ./iostream.jl:152
 [13] bson(::String, ::Dict{Symbol,Any}) at /Users/dilum/.julia/v0.6/BSON/src/write.jl:83

julia>

[DilumAluthge]

So it looks like you can't have a dict with non-symbol keys anywhere inside the object you are trying to save - with the very weird exception of numerical keys and numerical values.

[DilumAluthge]

~~I've found a hacky way to solve this issue - see PR #6.~~

[DilumAluthge]

Disregard my previous comment - see better PR here: #7

[YingboMa]

The following code produces this error, too.

using StochasticDiffEq, BSON

function lorenz(du,u,p,t)
  du[1] = 10.0(u[2]-u[1])
  du[2] = u[1]*(28.0-u[3]) - u[2]
  du[3] = u[1]*u[2] - (8/3)*u[3]
end

function σ_lorenz(du,u,p,t)
  du[1] = 3.0
  du[2] = 3.0
  du[3] = 3.0
end

prob_sde_lorenz = SDEProblem(lorenz,σ_lorenz,[1.0,0.0,0.0],(0.0,10.0))
sol = solve(prob_sde_lorenz, SOSRA2())
bson("/tmp/test.bson",Dict(:sol=>sol))

julia> bson("/tmp/test.bson",Dict(:sol=>sol))
ERROR: UndefRefError: access to undefined reference
Stacktrace:
 [1] lower at /home/scheme/.julia/packages/BSON/kxdIr/src/extensions.jl:66 [inlined]
 [2] _lower_recursive(::Array{Tuple{Float64,Array{Float64,1},Array{Float64,1}},1}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [3] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::Array{Tuple{Float64,Array{Float64,1},Array{Float64,1}},1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [4] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:28
 [5] _lower_recursive(::Array{Any,1}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [6] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [7] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Dict{Symbol,Any}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:21
 [8] _lower_recursive(::DataStructures.DequeBlock{Tuple{Float64,Array{Float64,1},Array{Float64,1}}}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [9] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::DataStructures.DequeBlock{Tuple{Float64,Array{Float64,1},Array{Float64,1}}}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [10] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:28
 [11] _lower_recursive(::Array{Any,1}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [12] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [13] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Dict{Symbol,Any}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:21
 [14] _lower_recursive(::DataStructures.Deque{Tuple{Float64,Array{Float64,1},Array{Float64,1}}}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [15] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::DataStructures.Deque{Tuple{Float64,Array{Float64,1},Array{Float64,1}}}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [16] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:28
 [17] _lower_recursive(::Array{Any,1}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [18] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [19] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Dict{Symbol,Any}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:21
 [20] _lower_recursive(::DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [21] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [22] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:28
 [23] _lower_recursive(::Array{Any,1}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [24] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [25] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Dict{Symbol,Any}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:21
 [26] _lower_recursive(::DiffEqNoiseProcess.NoiseProcess{Float64,2,Float64,Array{Float64,1},Array{Float64,1},Array{Array{Float64,1},1},typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_DIST),typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_BRIDGE),true,DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},ResettableStacks.ResettableStack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},DiffEqNoiseProcess.RSWM{:RSwM3,Float64},RandomNumbers.Xorshifts.Xoroshiro128Plus}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [27] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::DiffEqNoiseProcess.NoiseProcess{Float64,2,Float64,Array{Float64,1},Array{Float64,1},Array{Array{Float64,1},1},typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_DIST),typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_BRIDGE),true,DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},ResettableStacks.ResettableStack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},DiffEqNoiseProcess.RSWM{:RSwM3,Float64},RandomNumbers.Xorshifts.Xoroshiro128Plus}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [28] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:28
 [29] _lower_recursive(::Array{Any,1}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [30] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [31] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Dict{Symbol,Any}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:21
 [32] _lower_recursive(::RODESolution{Float64,2,Array{Array{Float64,1},1},Nothing,Nothing,Array{Float64,1},DiffEqNoiseProcess.NoiseProcess{Float64,2,Float64,Array{Float64,1},Array{Float64,1},Array{Array{Float64,1},1},typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_DIST),typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_BRIDGE),true,DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},ResettableStacks.ResettableStack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},DiffEqNoiseProcess.RSWM{:RSwM3,Float64},RandomNumbers.Xorshifts.Xoroshiro128Plus},SDEProblem{Array{Float64,1},Tuple{Float64,Float64},true,Nothing,Nothing,SDEFunction{true,typeof(lorenz),typeof(σ_lorenz),UniformScaling{Bool},Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing},typeof(σ_lorenz),Nothing,Nothing},SOSRA2,StochasticDiffEq.LinearInterpolationData{Array{Array{Float64,1},1},Array{Float64,1}}}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [33] (::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}})(::RODESolution{Float64,2,Array{Array{Float64,1},1},Nothing,Nothing,Array{Float64,1},DiffEqNoiseProcess.NoiseProcess{Float64,2,Float64,Array{Float64,1},Array{Float64,1},Array{Array{Float64,1},1},typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_DIST),typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_BRIDGE),true,DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},ResettableStacks.ResettableStack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},DiffEqNoiseProcess.RSWM{:RSwM3,Float64},RandomNumbers.Xorshifts.Xoroshiro128Plus},SDEProblem{Array{Float64,1},Tuple{Float64,Float64},true,Nothing,Nothing,SDEFunction{true,typeof(lorenz),typeof(σ_lorenz),UniformScaling{Bool},Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing},typeof(σ_lorenz),Nothing,Nothing},SOSRA2,StochasticDiffEq.LinearInterpolationData{Array{Array{Float64,1},1},Array{Float64,1}}}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [34] applychildren!(::getfield(BSON, Symbol("##7#11")){IdDict{Any,Any},Array{Any,1}}, ::Dict{Symbol,Any}) at /home/scheme/.julia/packages/BSON/kxdIr/src/BSON.jl:21
 [35] _lower_recursive(::Dict{Symbol,RODESolution{Float64,2,Array{Array{Float64,1},1},Nothing,Nothing,Array{Float64,1},DiffEqNoiseProcess.NoiseProcess{Float64,2,Float64,Array{Float64,1},Array{Float64,1},Array{Array{Float64,1},1},typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_DIST),typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_BRIDGE),true,DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},ResettableStacks.ResettableStack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},DiffEqNoiseProcess.RSWM{:RSwM3,Float64},RandomNumbers.Xorshifts.Xoroshiro128Plus},SDEProblem{Array{Float64,1},Tuple{Float64,Float64},true,Nothing,Nothing,SDEFunction{true,typeof(lorenz),typeof(σ_lorenz),UniformScaling{Bool},Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing},typeof(σ_lorenz),Nothing,Nothing},SOSRA2,StochasticDiffEq.LinearInterpolationData{Array{Array{Float64,1},1},Array{Float64,1}}}}, ::IdDict{Any,Any}, ::Array{Any,1}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:62
 [36] lower_recursive(::Dict{Symbol,RODESolution{Float64,2,Array{Array{Float64,1},1},Nothing,Nothing,Array{Float64,1},DiffEqNoiseProcess.NoiseProcess{Float64,2,Float64,Array{Float64,1},Array{Float64,1},Array{Array{Float64,1},1},typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_DIST),typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_BRIDGE),true,DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},ResettableStacks.ResettableStack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},DiffEqNoiseProcess.RSWM{:RSwM3,Float64},RandomNumbers.Xorshifts.Xoroshiro128Plus},SDEProblem{Array{Float64,1},Tuple{Float64,Float64},true,Nothing,Nothing,SDEFunction{true,typeof(lorenz),typeof(σ_lorenz),UniformScaling{Bool},Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing},typeof(σ_lorenz),Nothing,Nothing},SOSRA2,StochasticDiffEq.LinearInterpolationData{Array{Array{Float64,1},1},Array{Float64,1}}}}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:73
 [37] bson(::IOStream, ::Dict{Symbol,RODESolution{Float64,2,Array{Array{Float64,1},1},Nothing,Nothing,Array{Float64,1},DiffEqNoiseProcess.NoiseProcess{Float64,2,Float64,Array{Float64,1},Array{Float64,1},Array{Array{Float64,1},1},typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_DIST),typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_BRIDGE),true,DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},ResettableStacks.ResettableStack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},DiffEqNoiseProcess.RSWM{:RSwM3,Float64},RandomNumbers.Xorshifts.Xoroshiro128Plus},SDEProblem{Array{Float64,1},Tuple{Float64,Float64},true,Nothing,Nothing,SDEFunction{true,typeof(lorenz),typeof(σ_lorenz),UniformScaling{Bool},Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing},typeof(σ_lorenz),Nothing,Nothing},SOSRA2,StochasticDiffEq.LinearInterpolationData{Array{Array{Float64,1},1},Array{Float64,1}}}}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:81
 [38] #14 at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:83 [inlined]
 [39] #open#292(::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::getfield(BSON, Symbol("##14#15")){Dict{Symbol,RODESolution{Float64,2,Array{Array{Float64,1},1},Nothing,Nothing,Array{Float64,1},DiffEqNoiseProcess.NoiseProcess{Float64,2,Float64,Array{Float64,1},Array{Float64,1},Array{Array{Float64,1},1},typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_DIST),typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_BRIDGE),true,DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},ResettableStacks.ResettableStack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},DiffEqNoiseProcess.RSWM{:RSwM3,Float64},RandomNumbers.Xorshifts.Xoroshiro128Plus},SDEProblem{Array{Float64,1},Tuple{Float64,Float64},true,Nothing,Nothing,SDEFunction{true,typeof(lorenz),typeof(σ_lorenz),UniformScaling{Bool},Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing},typeof(σ_lorenz),Nothing,Nothing},SOSRA2,StochasticDiffEq.LinearInterpolationData{Array{Array{Float64,1},1},Array{Float64,1}}}}}, ::String, ::Vararg{String,N} where N) at ./iostream.jl:369
 [40] open at ./iostream.jl:367 [inlined]
 [41] bson(::String, ::Dict{Symbol,RODESolution{Float64,2,Array{Array{Float64,1},1},Nothing,Nothing,Array{Float64,1},DiffEqNoiseProcess.NoiseProcess{Float64,2,Float64,Array{Float64,1},Array{Float64,1},Array{Array{Float64,1},1},typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_DIST),typeof(DiffEqNoiseProcess.INPLACE_WHITE_NOISE_BRIDGE),true,DataStructures.Stack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},ResettableStacks.ResettableStack{Tuple{Float64,Array{Float64,1},Array{Float64,1}}},DiffEqNoiseProcess.RSWM{:RSwM3,Float64},RandomNumbers.Xorshifts.Xoroshiro128Plus},SDEProblem{Array{Float64,1},Tuple{Float64,Float64},true,Nothing,Nothing,SDEFunction{true,typeof(lorenz),typeof(σ_lorenz),UniformScaling{Bool},Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing,Nothing},typeof(σ_lorenz),Nothing,Nothing},SOSRA2,StochasticDiffEq.LinearInterpolationData{Array{Array{Float64,1},1},Array{Float64,1}}}}) at /home/scheme/.julia/packages/BSON/kxdIr/src/write.jl:83
 [42] top-level scope at none:0

julia>

[devmotion]

The same error occurs when saving an optimizer in Flux: https://github.com/FluxML/Flux.jl/issues/737

As far as I can see, the underlying problem is that it is not possible to save an IdDict.

[DilumAluthge]

Actually, the underlying problem here is that currently BSON.jl cannot handle arrays with undefined values. The issue for tracking this is: https://github.com/MikeInnes/BSON.jl/issues/43

Not being able to save certain Dicts is just a symptom of https://github.com/MikeInnes/BSON.jl/issues/43. The underlying implementation of Dict means that Dicts will often contain (under the hood) one or more Arrays with undefined values. In order to save/load the Dict, you need to be able to save/load the Arrays.

Once https://github.com/MikeInnes/BSON.jl/issues/43 is solved, there will be no problem saving/loading any kind of Dict.

[CarloLucibello]

examples in https://github.com/JuliaIO/BSON.jl/issues/3#issuecomment-392226367 all work now, this should be closed

[DilumAluthge]

examples in #3 (comment) all work now, this should be closed

Before we close this issue, I think that we should take the examples from that issue and add them to the test suite of this package.

[kafisatz]

I note that this error also happens in the absence of undef entries. I ran into this with a dataframe column type

SentinelArrays.SentinelArray{String,1,UndefInitializer,Missing,Array{String,1}})

see https://github.com/JuliaData/SentinelArrays.jl/issues/24#issuecomment-667907257

[umbriquse]

Also getting this error using the AbstractFFTs package.

using AbstractFFTs

a = FFTW.plan_fft(Array{Complex{Float64}}(undef,1))

var1 = Dict(:fft => a)

path = "_research/tmp/"
mkpath(path)

bson(path*"1.bson",var1)

typeof(a) = FFTW.cFFTWPlan{Complex{Float64},-1,false,1,UnitRange{Int64}}

I'm fairly new to Julia, so I'm not sure If there's more information I can provide to help pinpoint how/where this error is occurring.