I’m just a beginner and now i stuck in this error . Thanks for your help !
Looks like something’s broken in the solution setup. Close MonoDevelop, open your project folder, and delete the .sln and .csproj files. Unity automatically generates them, so there’s nothing to worry about.
Then, open your scripts from Unity again, through Assets/Open C# Project.
MonoDevelop is a piece of junk, and generally super buggy. Unity comes with Visual Studio these days, which is… less bad! If you installed that when you installed Unity, you can select it in File/Preferences. If not, you can run the installer again and select it. Note, it’s huge and takes a while to download.
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Oh Thank you very much . I fixed it . !!