I have tried to upload the zip file with my pset4 code to the CS50 submit function several times. I can add the files, but when I hit the upload button, the file appears to upload (the bottom green bar processes quickly), but the upper green bar continues to process and doesn't go away. I usually get an email from the CS50 bot pretty quickly after the upload, but haven't received anything yet.

Has anyone else had this problem? Does anyone know how to resolve?

Thanks for your help.

  • I've had this problem as well. Nobody has been able to give me an answer as yet.
    – Kim
    Commented Dec 15, 2014 at 3:04

2 Answers 2


I had the same problem several days ago, and was able to finally use it today!! I'm guessing it's part of their transition to the new year. Hope it's not a sign of things to come but just growing pains. Best of luck,



I got my upload right after having the similar issue. Here is what I did:

I actually opened the zip file that I downloaded which was intended to upload only to find that the copy.bmp file in pset4/bmp folder was corrupt. Rectified the issue and downloaded the zip again and verified that every file was accessible or readable and uploaded it again. Viola!!!

I suggest that you open all the files present in the zip that is to be uploaded. If some file is unable to be opened/corrupt you should likely rectify that and try to upload again.

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