Unity 6.5 "Internal Base Class Library" issues.

[Propel-antonin]

Hi,
We recently tried to upgrade from Unity 6 to 6.5 and got a bunch of errors related to package installed with NuGetForUnity.
We were installing System.Text.Json as well as Microsoft.CodeAnalysis.Analyzers & Microsoft.CodeAnalysis.CSharp.

After digging a bit, we realized that Unity already provides versions of those dll internally, which seems to be causing issues with version dependencies and whatnot.
System.Text.Json
System.Collections.Immutable
System.Reflection.Metadata
System.Runtime.CompilerServices.Unsafe
https://docs.unity3d.com/6000.5/Documentation/Manual/UpgradeGuideUnity65.html#programming

Here is an example of the kind of error we've been saying.

Do you have any clue as to how we can fix this?

[Propel-antonin]

0f8ef2daa8a49dbb07548c43.zip idk but this helped me once

I'm not clicking that, can we report this guy somehow?

[Propel-antonin]

For the record, manually deleting those dependencies & downgrading the Code Analysis version from 5.3 to 3 seemed to have worked temporarily.

[JoC0de]

Did you installed the package after switching to Unity 6.5 or at least deleted everything from the NuGetForUnity NuGet install location? Normally NuGetForUnity should detect already available .dlls

[Propel-antonin]

@JoC0de I installed the package before switching to Unity 6.5.
Uninstalling it and reinstalling did not seem to fix it. It's almost like NuGetForUnity could not detect Unity's new provided dlls