unable to uninstall SystemNotifications without errors

[benbyf]

Thought I's try SystemNotifications and found it over kill as I would get alot of warnings, changes and errors appearing and persisting which was scaring my client. But now I'm unable to uninstall it without getting errors on the user edit page saying it requires a module that doesnt exsist any more... anyone had this issue or can recommend how to use this module correctly?