Unity 2021.2, MRTK 2.7 give compilation errors.

[bjornsyse]

Hi, I'm trying to add MRTK to Unity 2021.2 using the MixedRealityFeatureTool.exe. I've added these packages;

"com.microsoft.mixedreality.toolkit.foundation": "file:MixedReality/com.microsoft.mixedreality.toolkit.foundation-2.7.2.tgz",
"com.microsoft.mixedreality.toolkit.standardassets": "file:MixedReality/com.microsoft.mixedreality.toolkit.standardassets-2.7.2.tgz"

but I end up with multiple compilation error in \Core\Extensions\SystemNumericsExtensions.cs. around System.Numerics package.

Assets\MRTK\Core\Extensions\SystemNumericsExtensions.cs(13,79): error CS0433: The type 'Vector3' exists in both 'System.Numerics.Vectors, Version=4.1.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Numerics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
Assets\MRTK\Core\Extensions\SystemNumericsExtensions.cs(21,71): error CS0433: The type 'Vector3' exists in both 'System.Numerics.Vectors, Version=4.1.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Numerics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
Assets\MRTK\Core\Extensions\SystemNumericsExtensions.cs(33,85): error CS0433: The type 'Quaternion' exists in both 'System.Numerics.Vectors, Version=4.1.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Numerics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
Assets\MRTK\Core\Extensions\SystemNumericsExtensions.cs(38,74): error CS0433: The type 'Matrix4x4' exists in both 'System.Numerics.Vectors, Version=4.1.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Numerics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
Assets\MRTK\Core\Extensions\SystemNumericsExtensions.cs(44,39): error CS0433: The type 'Matrix4x4' exists in both 'System.Numerics.Vectors, Version=4.1.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Numerics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
Assets\MRTK\Core\Extensions\SystemNumericsExtensions.cs(53,74): error CS0433: The type 'Quaternion' exists in both 'System.Numerics.Vectors, Version=4.1.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Numerics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

Problem is it says The type 'Vector3' exists in both 'System.Numerics.Vectors, and 'System.Numerics. I tried changing it to System.Numerics.Vectors.Vector3 but get the error
The type or namespace name 'Vectors' does not exist in the namespace 'System.Numerics' (are you missing an assembly reference?)

What's going on here. Am I missing something else? Is MRTK not compatible with Unity 2021.2?

Regards

• Björn

[keveleigh]

This was an issue on the Unity side. I thought they had shipped the fix in recent versions of Unity 2021.2. Which version are you using?

[bjornsyse]

Thanks yes I'm on 2021.2 and it seems to have been fixed. My error shows to have been a conflict with a bundled System.Numerics.dll inside this VLC for unity package. Here is a related report: https://code.videolan.org/videolan/vlc-unity/-/issues/102