3392568 - Job SM:EXEC SERVICE cancels due to error "Exception \CLASS=CX_SERV_ADM_ENQUEUE_ERROR in CL_SERV_SESSION_MAIN_JOB LOCK_JOB 20"

SAP EarlyWatch Alert reports are not getting generated as scheduled. And the following error message can be found in job log SM:EXEC SERVICE.

Job Log : SM:EXEC SERVICES 

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 Job started

 Step 001 started (program RDSMOPBACK_AUTOSESSIONS_ALL, variant , user * )

 Exception \CLASS=CX_SERV_ADM_ENQUEUE_ERROR in CL_SERV_SESSION_MAIN_JOB LOCK_JOB 20

 Main job SM:EXEC SERVICES is currently running

 Job finished

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SAP Solution Manager 7.2

Exception \CLASS=CX_SERV_ADM_ENQUEUE_ERROR in CL_SERV_SESSION_MAIN_JOB LOCK_JOB 20, SM: EXEC SERVICE, Service content update, SAP EarlyWatch Alert reports , KBA , SV-SMG-SER-EWA , EarlyWatch Alert , Problem