Error: KeychainStore Ignored Exception, Duplicate extensions not allowed


The following is present in the scheduler debug.log on Mac OS X: KeychainStore Ignored Exception: Duplicate extensions not allowed


This appears to be some interaction between an in-place upgrade of Mac OS and the CS backup agent software.


  1. If the backup schedule is being missed, reinstall the latest version of the backup agent.
  2. If the backups are running and completing successfully, no action is required and the warning can be ignored.