# Re-install the module

Try a disable/uninstall of the og module, then re-install the module.

Sometimes it helps to restore and/or repair these kinds of problems.

# Increase memory limit

Another option might be that you need to increase the memory size of your Drupal site  (add 25 to 50% of memory, or just double it). And then retry uninstall/reinstall one more time. Because each time you install a module, your site will be using more memory. So at some point (if you never increase the memory), you'll hit your available memory limit.

Assuming this is NOT a multi site, consider editing your `/sites/default/settings.php`, and change the line to set the memory limit. If it is a multi site, then edit the `settings.php` file related to the site where you are experiencing the problem.

 That line in settings.php should look similar to this:

    `ini_set('memory_limit', '100M');`

 The '100M' in it might be some other number. Whatever the number is, try to increase it with like 50%, or maybe even double it to see what happens after you do so (of course do not forget to save the file after increasing that number).

 If needed, refer to https://www.drupal.org/node/207036 for more details, eg if such 'ini_set' is not yet included in your `settings.php` file. As mentioned in that link: "*Locate the PHP settings section and add that line at the end of that section*".

# Check logfiles
If none of the above helps, then check your log files (both Drupla logs and/or server logs) to find some kind of indication of possible errors.