Version 1.8.15 on Windows 10.
Even the example sketches, like "blink" make the same error.
I have a second PC with the same version IDE and OS and it compiles my project files with no problems.
The error says "FileNotFoundError: [WinError 2] The system cannot find the file specified", but I don't know which file it can't find.
The only thing I could find in a Google search was to reinstall the IDE. But doesn't that wipe out all of the libraries that I've added?
Any advise at this point would be appreciated.