I recently found this error message after upgrading to GP2010 R2, though it doesn’t have any impact towards other users’ sessions and even the customizations.
This happens only for an “sa” login. Very strange error message.
UPDATE 1: This is happening for all users who have access to Field Service module. If you see the above message, the error is thrown by Field Service VBA project.
UPDATE 2: Issue is resolved. Please read my next post to know better about this message.