FastScriptReload
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It was not possible to find any compatible framework version - compilation failed

Don't have log any more and for the moment can't install plugin again to regenerate it.
Installed components (apart form standard Unity):

I also have 2 Unity editor versions installed:

Please tell me what other data you would need or what to check?
This isn't an FSR problem. Check out this StackOverflow answer on a possible approach to fix your issue. https://stackoverflow.com/a/58702215
This isn't an FSR problem. Check out this StackOverflow answer on a possible approach to fix your issue. https://stackoverflow.com/a/58702215
It's not a problem with my setup. I don't have any problems at all with Unity normal workflow and compilation, this problem is only happening when using FSR to compile code. Alternative solution "Hot Reload" also works fine.
Thanks @akarpinski1 - tool should use existing CSC (compiler) that Unity uses and shouldn't throw this exception.
One thing that I though could happen is wrong compiler version picked up (maybe due to multiple versions).
If you can recreate the issue and add a debug breakpoint here: (or log parameters) FastScriptReload.Editor.Compilation.DotnetExeDynamicCompilation.ExecuteDotnetExeCompilation
I'd be interested to know what's in string dotnetExePath string cscDll
and then to see what versions of those files you have

I've seen it before but couldn't reproduce. As @Chizaruu mentioned I think it'll be some specific environemnt issue
Hello,
Both files points to what is shipped with editor in use for given project:

and version of those files:

I also double checked this on second PC. Same editor version (2020.3.44f1), Same behavior - exact same error.
I had the same issue and solved it by installing .NET Core 2.0.0. https://dotnet.microsoft.com/en-us/download/dotnet/2.0
I had the same issue and solved it by installing .NET Core 2.0.0. https://dotnet.microsoft.com/en-us/download/dotnet/2.0
same error, i dont know why, but it works