I upgraded my Drupal to the latest version. I also did this with the modules. When I was doing this I got an error for the "sharethis" module. I got a message that told me to upgrade that module myself, so I uploaded the new module files.
But the module isn't working anymore, and when I look at the module-list I cannot find "sharethis".
This is what I see: ShareThis Block 7.x-2.2 This module creates a custom block for the ShareThis widget. Vereist: Sharethis (MISSING)
When trying to reinstall the module I get this message: "Sharethis is aleady installed"
So I can't uninstall/install this module! Also when deleting the directory it gives the same error. (already installed) So I want to delete and re-install a module that's not visible in the module-list.