Error: The XML you provided was not well-formed or did not validate against our published schema

I encountered the above error when trying to upload folders to my dataset. I did a quick lookup, it seems to be an error coming from the Amazon server.

This error happens when I’m trying to upload tar files, after all of them are done hashing, this error pops up. Any idea as to why this is happening? I’ve included a screenshot of the error below.