Problem with Upload Score Audio

So, for the most part, I love the feature "Upload Score Audio." Recently however, it has been saying that it cannot upload the score audio. I don't know how to fix it because it doesn't tell me what is causing the problem, and I've tried re-uploading, reconfiguring the score itself, I've tried playing with the mixer, but nothing seems to work at all. The problem seems to happen as soon as the percentage bar fills when the score is uploading, that's the only clue I have. Any advice on how to fix this problem?
-Ceascer