I've tried to upload my latest Dream for the alienware contest which is 50mb, three times now, but every time I get this error:

I definitely made sure I was uploading the right .dream file, and it seems to be working, until it's finished uploading then it gives that error message. My previous Dream uploaded fine without any problems, so I don't see why it's not working now. 50mb is kinda big, but my other dream I submitted was 58mb, and it worked fine.
Please help..this is getting frustrating.