Thats not the error you reported. You reported a spider friendly issue which we responded to. As far as bad gateway thats a server communication issue and does not appear to be apart of the software as that specific error notes there is a problem with one server communicating with another in sending the file which means it is not even reaching the software to be processed. Try uploading from another computer etc and test things. You can also post a url and test login here for us to try uploading as well.