Error loading module file () - Wordpress
This typically happens when either a) an extension is deleted, or b) the location of the extension changes.

First, make the easy fix.  Go to Administer menu > System Settings > Cleanup Caches and Update Paths.  Press "Clear Caches", and reload the page TWICE.  Hopefully that fixes the error.  If not - check that page and make sure the paths are 100% correct.

If that doesn't work, go to Administer menu > System Settings > Manage Extensions and look for anything amiss.  Take special note of missing extensions - see if they're actually missing in the file system.

This should get you all cleaned up, or at least on the right track!