^ not defined.

[lrnv]

I have the following stacktrace:

ERROR: ^ not defined for MultiFloat{Float64, 4}
Stacktrace:
  [1] error(::String, ::String, ::Type)
    @ Base .\error.jl:42
  [2] no_op_err(name::String, T::Type)
    @ Base .\promotion.jl:395
  [3] ^(x::MultiFloat{Float64, 4}, y::MultiFloat{Float64, 4})