UMP Unknown Error

Document ID : KB000118431
Last Modified Date : 25/10/2018
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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: 
UIM 5.8.1
The mpse probe on the Primary Hub was not runuing.
The mpse\config\log4j.xml file was empty.
Redeploy the mpse probe to the primary hub.
Deactivate and Activate the wasp on the UMP server.