CA PPM: Processes are not running and the BG log shows errors

Document ID : KB000107960
Last Modified Date : 10/08/2018
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Question:
Processes are not running and the BG log shows below errors:

ERROR 2018-07-25 07:06:15,332 [NMS Message Receiver (tenant=clarity)] bpm.eventmgr (clarity:none:none:none) Error in onMessage. 
java.util.concurrent.RejectedExecutionException: Task com.niku.bpm.eventmgr.ObjectEventHandler@59fe52ce rejected from java.util.concurrent.ThreadPoolExecutor@25558c40[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 212] 
at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2047) 
at 

ERROR 2018-07-25 07:10:38,683 [Incoming-1,CLRTY,sc5app1755-46758] bpm.eventmgr (clarity:none:none:none) Error in onMessage while processing Broadcast Message pe.monitor.GET_STATE 
java.util.concurrent.RejectedExecutionException: Task com.niku.bpm.engine.monitor.MonitorEventHandler@2a81be26 rejected from java.util.concurrent.ThreadPoolExecutor@25558c40[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 212] 
at 

How do I solve the problem?
Answer:
To solve this problem please restart BG services