Compilation errors with every project (including blank projects with NO scripts)

I’m having an issue getting any project to load at all. Every single project I start or load has compilation errors, whether I have a script or not. I get the classic red console error, with just a timestamp, but only one (not multiple like other people have been getting).

I’ve added blank scripts and it’s broken. I’ve reimported old scripts and it’s broken. I’ve reset all my packages and it’s broken.

For reference, I have already tried the method of changing the application contents to csc.exe method, and my unity_csc.bat file looks like this:

@ OFF
set APPLICATION_CONTENTS=%~dp0…..
“%APPLICATION_CONTENTS%\Tools\Roslyn\csc.exe” /shared %*
exit /b %ERRORLEVEL%

I also tried the method of hard coding the path to the csc.exe application, so both methods don’t work.

Nothing is working at all. It doesn’t matter what version, it doesn’t matter if I install a new version, or update Windows. Nothing is fixing this issue. It started yesterday for no reason, on an existing project, so I’m unsure what to do. Anybody know anything that might help?

What Unity version? When you run, do you get the “All compiler errors must be fixed first” ?