Error on Local configuration tab after I edited the authorized document types

On a workspace I denied some document types from the Manage > Local configuration tab, when I had all modules installed. Unauthorized types are: forum, topic, audio and video.
Then I uninstalled Social Collaboration. Now, when I want to go on the Local configuration tab to authorize them, I get an error.
If I reinstall Social Collab, I can go on the Local configuration tab without error.