.NET: Failed to load project assembly, Cannot instance script because the associated class could not be found.

[MrZak-dev]

Godot version

4.0.beta6.mono.official

System information

Windows 11 , dotnet 6.0.402

Issue description

Moving ProjectName.sln outside the project dir causes the engine to fail loading the project assembly .

The project i am working on contains multiple dotnet core projects alongside the Godot project and am trying to follow this folder structure :

MainFolder ├── ProjectName.sln ├── src │ ├── ProjectName (godot project ) │ │ ├── ProjectName.csproj │ │ ├── project.godot │ ├── ProjectName.AnotherDotnetProject │ │ ├── ProjectName.AnotherDotnetProject.csproj

in the godot project i have set the Settings > Dotnet > Project :

Assembly Name : ProjectName Solution Directory : ../../ C# Project Directory : .

i have modified the .sln file to point to the correct .csproj . There is NO ISSUE building the project with godot editor or dotnet build. But when am running the project it fails to load all .cs classes and the console prints .NET: Failed to load project assembly with a list of .cs files:

Example with --verbose enabled

TextServer: Primary interface set to: "ICU / HarfBuzz / Graphite (Built-in)".
.NET: Initializing module...
Found hostfxr: C:\Program Files\dotnet\host/fxr/7.0.0/hostfxr.dll
.NET: hostfxr initialized
.NET: GodotPlugins initialized
.NET: Failed to load project assembly
CORE API HASH: 2925030599
EDITOR API HASH: 2261696631
Loaded builtin certs
ERROR: Cannot instance script because the associated class could not be found. Script: 'res://Node2D.cs'.
   at: (modules/mono/csharp_script.cpp:2288)

Steps to reproduce

• Create godot dotnet project.
• move .sln file outside main project folder
• update .sln file to point to the correct .csproj folder
• update Solution Directory and C# Project Directory from the godot dotnet settings ,
• build success but running the project fails .

Minimal reproduction project

DotnetSolutionDirectory.zip

[MrZak-dev]

Maybe related to this 9c698629499a9a8fffb74a3ec4c2bfac6b7a1484 .

[raulsntos]

I think Godot is trying to find the assembly in the .godot directory relative to the Godot project directory: /src/DotnetSolutionDirectory/.godot/mono/temp/bin/Debug/DotnetSolutionDirectory.dll

But due to the Godot.NET.Sdk props, the output is likely relative to the .sln file which means the assembly is built to: /.godot/mono/temp/bin/Debug/DotnetSolutionDirectory.dll

https://github.com/godotengine/godot/blob/4a82d71d7345d0dde4da2816fd489da1c303f580/modules/mono/editor/Godot.NET.Sdk/Godot.NET.Sdk/Sdk/Sdk.props#L15-L17

https://github.com/godotengine/godot/blob/4a82d71d7345d0dde4da2816fd489da1c303f580/modules/mono/editor/Godot.NET.Sdk/Godot.NET.Sdk/Sdk/Sdk.props#L20-L21

[raulsntos]

Fixed by https://github.com/godotengine/godot/pull/69391

Note that the .csproj location is no longer configurable and must always be next to the project.godot file now, which it is in your case so you should be good.

[jboyle]

Saw this error on 4.1.2

It was happening because I had an apostrophe in my project's name.