An object of class MonitoringAlert with ID was not found


In my test environment I was runnning into the following event when opening an active alert:


When you access the System Center Operations Manager Console, the alerts are cached  in your profile in a file called momcache.mdb.

The System Center Operations Manager user console creates a cache file in %localappdata%\Microsoft\Microsoft.EnterpriseManagement.Monitoring.Console. To resolve the above error there are 2 options.

  • Use the “clearcache” option:
    1. Right Click on the "System Center Operations Manager" and select “Properties
      Properties System Center Operations Manager Console
    2. On the “Operations Console Properties” page on the “Shortcut” tab in the “Target” section enter “”C:\Program Files\System Center 2012\Operations Manager\Console\Microsoft.EnterpriseManagement.Monitoring.Console.exe" /clearcache"
  • Delete the “momcache.mdb” from the file location “%localappdata%\Microsoft\Microsoft.EnterpriseManagement.Monitoring.Console