Drupal 7 "Page not found. The requested page "/" could not be found" after enabling module
After extensive research I managed to solve this issue. The following info was helpful:
https://www.drupal.org/node/262892

What I did:


Disabled the problem module in the system table in SQL, by setting
the status field of the suspect module to 0 in the {system} table.
Rebuilded Database menu system to get access again, by running update.php. The update.php by default don't allow to access, so I need to edit settings.php (located in /sites/default/) and change
$update_free_access = FALSE; to TRUE. After rebuilding menu remember
to change this back to FALSE.