How can i fix this Compiler Error?

I added a script to an object and it wont appear in the Inspector for me to set the variables... Also when i click 'play' it says: "All Compiler errors have to be fixed before..." and when i go to the error it is written:

"Could not start compilationWin32Exception: ApplicationName='"H:/Nova pasta/Editor/Data/Mono\bin\mono.exe"', CommandLine='"H:/Nova pasta/Editor/Data/Mono\lib/mono/unity\us.exe" System.Diagnostics.Process.Start_noshell (System.Diagnostics.ProcessStartInfo startInfo, System.Diagnostics.Process process)"

Also i am using JavaScript

Please help me