Issue
When performing a file upload through the web browser I get the following error message:
Error uploading file. Failed to write file to disk.
Reason
This happens because the server-side code cannot write new information to disk. This can happen because the disk quota has been reached, the disk is full or the web user does not have write permissions.
Solution
To solve this problem check that you have enough space on your web server, and that the temporary and destination folders exist and allow the web user write permissions.