This may be due to an expired session. If you are not active on this application for 15 minutes or more, your session will time out. If you press the back or refresh button on your browser or have this application open in multiple tabs within your browser this will cause an access error. Your browser may not have deleted a previous session cookie for this site, try clearing any cookies for this site from your browser.
If you had completed your upload and been taken to the confirmation screen prior to this error, then your upload has been successful.
If you had not completed your upload and not been taken to the confirmation screen prior to this error, then any documents that had been uploaded have now been deleted. Please close your browser and try again.