I was uploading jpeg files just fine, then I started receiving the message, 'Omeka has encountered an error'. I ran the error log and got this:
2013-01-31T09:06:50-05:00 WARN (4): Omeka_Storage_Adapter_Filesystem: Tried to delete missing file 'files/5f000ba8157f3bbf488e95fb8f9b835a.jpg'.
2013-01-31T09:06:50-05:00 ERR (3): exception 'Omeka_File_Derivative_Exception' with message 'Something went wrong with image creation. Please notify an administrator.' in /var/www/html/omeka/application/libraries/Omeka/File/Derivative/Image.php:189
Any idea what I can do to allow jpegs to be uploaded and displayed again?