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How can I disable ZOS related tasks?

I keep on getting diagnostic errors for ZOS related tasks. We don't even use ZOS. I have tried restarting the host, clearing the cache on the host, and looked for some server property, but to no avail. And there are no clues, that I can tell, in the server logs. Any suggestions on how to disable these tasks once and for all? Should I just ignore them under the following property:
com.ibm.team.repository.service.diagnostics.basic.internal.BackgroundTaskDiagnostic
Here are the two diagnostics I keep on getting every 24 hrs otherwise:
The diagnostic "Background Task" reports an ERROR: <o:p> </o:p>
CRJAZ1990E 2 tasks have been unscheduled due to unexpected errors, including the task "com.ibm.team.enterprise.zos.systemdefinition.migration.SystemDefinitionMigrationTask". Please check your server logs for details. Once you have addressed the issues, you should restart the server to reschedule this background task.
The diagnostic "Background Task" reports an ERROR: <o:p> </o:p>
CRJAZ1990E 2 tasks have been unscheduled due to unexpected errors, including the task "com.ibm.team.enterprise.zos.systemdefinition.migration.SystemDefinitionMigrationTask". Please check your server logs for details. Once you have addressed the issues, you should restart the server to reschedule this background task. <o:p> </o:p>