I think we'll need a little more information to be able to properly help you. Depending on the exact error this could mean one of several things:
* The compiler cannot find the input file `filename.nim` * Your program is importing another nim file that cannot be found. * Your program is trying to open another file that cannot be found. Please copy and paste the command you are running and the exact output. It may also be helpful to show your nim file. If your nim file is more than a few lines, please try to create a small file, ideally less than 10 lines, that causes the same error to occur and post that as well.