There might be corrupted data in some internal Cognos notification tables.

Please follow the steps in the following link:

http://www-01.ibm.com/support/docview.wss?uid=swg22001203

Note:

  • This clears out some internal working tables, it does not delete the existing report schedules.
  • The note mentions Cognos 11, but the same applies to Cognos 10