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Fixed in 2022.1.X

Fix In Review for 2021.2.X



Found in

Issue ID




.NETStandard 2.1 in the editor is missing System.Memory, System.Buffers at runtime



When referencing .NETStandard 2.0 assemblies coming from NuGet package like System.Text.Json ( we are getting the following error in the Editor (before this, we need to disable validation for assemblies, as there is another set of validation errors separated from this issue)

Error: Could not load signature of System.HexConverter:ToBytesBuffer due to: Could not load file or assembly 'System.Memory, Version=, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies.
Unloading broken assembly Assets/Scenes/System.Text.Json.dll, this assembly can cause crashes in the runtime

The problem is that this System.Text.Json assembly comes only in .NETStandard 2.0 form but has dependencies to:

NuGet Packages:
- Microsoft.Bcl.AsyncInterfaces (>= 5.0.0)
- System.Text.Encodings.Web (>= 5.0.1)

Special NuGet Packages but when running in a .NET runtime supporting .NET Standard 2.1, these assemblies are included with the runtime:
- System.Buffers (>= 4.5.1)
- System.Memory (>= 4.5.4)
- System.Runtime.CompilerServices.Unsafe (>= 5.0.0)
- System.Numerics.Vectors (>= 4.5.0)
- System.Threading.Tasks.Extensions (>= 4.5.4)

So it seems that the editor doesn't have the special assemblies above (System.Buffers/System.Memory) in the runtime.
Checking further the AOT folder `Data\MonoBleedingEdge\lib\mono\unityaot-win32\Facades` and comparing it to the one used at editor time `Data\MonoBleedingEdge\lib\mono\unityjit-win32\Facades`, we can see that we are missing some of these assemblies:

- System.Buffers.dll
- System.Memory.dll
- System.Threading.Tasks.Extensions.dll

Copying these DLLs to the `unityjit-win32\Facades` folder is fixing the issue.

Reproducible with a recent 2021.2 or 2022.1

Attached a project that contains these assemblies to reproduce the issue.

  1. Response avatar

    Resolution Note (fix version 2022.1):

    The Unity 4.8 reference profile and the Unity JIT profiles have been updated to address the problem. The missing facade dlls have been added where needed.

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