Redmine

After uploading numerous attached files (all .gif), Redmine can not access them although the upload was confirmed and the image name is linked in the Issue Description, where the list of attachments is shown.

example: http://redmine.on-sitemanager.com/attachments/98/io_complete_online.gif

On clicking the attachment link, the link goes to an "Internal error" page:

"Internal error
An error occurred on the page you were trying to access.
If you continue to experience problems please contact your redMine administrator for assistance.

Back"

This is super annoying since now about 10 gifs, which were not stored outside of Redmine, have to be re-created and manually emailed to the other project team members. Grrrrr !