"What to do when a file is deleted and the 'Documents' module gives error?"

When you delete a file associated with a "Documents" module instance, you receive an error message. The only solution is to re-upload this missing file, to the original folder.

"But what will happen if you don't remember the name of the file?"

In this case, you should refer to the database table "Documents". You'll notice entries like "FileID=289" in "URL" column. You can now refer to "Files" table. Following this example, you can temporarily change the" FileID" of URL column, with an ID already present in "Files" table.

After the "Documents" module instance is functional again, you can change the document association from the module interface.