"Delete media files" not working


I am running an experiment with audio recordings. Everything works fine and file are uploading etc.
I wanted to use the “Delete media files” option (just to clear up some space, and to avoid downloading all of the files whenever I want to download files of new participants). However, I keep getting the following error:

And the files don’t get deleted.

  • I don’t know if it’s relevant, but in the past I did delete media files once without any issue (when I was testing the experiment before distributing it to participants, I was able to delete the uploads from my test runs).

It’s not a big deal since I can just keep going without deleting the files (unless this would cause issues at some point), but I was wandering if there’s a way to fix this…