Hi, I'm been having this issue for 4 days now. Things go like this: I have a Unity project that whenever I open it, some errors show up, saying only " Microsoft (R) Visual C# Compiler version 22.214.171.124535 (9d34608e)" When you select the error, nothing more is shown. No data or clue where to fix the issue. 15 of these errors show up. After some searching, I found out that if I remove the packages installed through the package manager, 14 of these errors disappear, but 1 remains. The thing is, I need all of the packages that I remove, so if I put them back, the 15 errors show again. And even if I delete them, the last one doesn't disappear. With these errors, I cannot even put "play" or do much on the editor. Things I have try: Deleting the project and download it again. Reimport all assets Unistall unity and install it again. Search for the same error on internet (9d34608e). Open a new project with the same Unity version (the errors do appear even in this new project which contains nothing). Reinstall java. Check Editor log, which displays this: Mono: successfully reloaded assembly - Completed reload, in 10.610 seconds [ScriptCompilation] Recompiling all scripts because: Reload of assemblies failed, assemblies are invalid or forced recompiled Microsoft (R) Visual C# Compiler version 126.96.36.199535 (9d34608e) Copyright (C) Microsoft Corporation. All rights reserved. And that is pretty much it. Here is how the error is displayed on the editor (as you can see, it doesn't show anything of what is actually wrong): Thanks to anyone reading this and willing to help. I'm on a big hole on this issue.