Action that causes Error: None - EventLog Error
Error Message: "The master secret has not been backed up ... "
Reason: Backing Up the master secret will help, as stated in the error message:
C:\Program Files\Common Files\Enterprise Single Sign-On\ssoconfig -backupsecret MasterSecret.bak
Note: The solutions in my posts may be the reason for specific errors but there is no guarantee because there are a lot of different system configurations and therefore many reasons for errors exist. But maybe they are useful hints.