Rebuild permissions error

I just upgraded the version of OG that our site was using. After doing so, it says that I need to rebuild content permissions.

I click the link to do so and I get an error:

An error has occurred.
Please continue to the error page

An AJAX HTTP error occurred. HTTP Result Code: 200 Debugging information follows. Path: /batch?id=231&op=do StatusText: OK ResponseText:

It gives me the "Initializing" status and then "Completed 0 of 1" before it fails.

I click the link to go to the error page, but that just takes me to the status report page for Drupal.

Nothing shows in my Drupal log.