UMP Unknown Error

Document ID : KB000118431
Last Modified Date : 25/10/2018
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Issue:
After logging into CA UMP getting "Unknown error". Message suggesting refreshing your browser may resolve the issue. Details: com.firehunter.ump.exceptions.DataFactoryException : com.firehunter.ump.exceptions.DataFactoryException: Column "CM_CONFIG_ITEM_TO_MASTER.master_id' is invalid in the select list because is is not contained in either an aggregate function or the GROUP BY clause. Please check the log for more information. Stack Trace: 
Environment:
UIM 5.8.1
Cause:
The mpse probe on the Primary Hub was not runuing.
The mpse\config\log4j.xml file was empty.
Resolution:
Redeploy the mpse probe to the primary hub.
Deactivate and Activate the wasp on the UMP server.