This error message indicates that the server is aware that it is on error or is incapable of performing the request.
The error will usually only occur during peak times when many members are attempting to upload or update content. This error has been known to affect Web App users more than those accessing the desktop site so we would recommend using the desktop site in these instances before contacting us.
In most cases it is a short-term issue that resolves itself, however, if you continue to experience issues, please contact us.