(TaskEventOrchestrator:ERROR) - java.lang.NullPointerException

HELLO ,

Could anyone tell me what is this error mean in My MWS server as it repeated several times in server log.

2019-09-07 00:00:01 EET (TaskEventOrchestrator:ERROR) - java.lang.NullPointerException
com.webmethods.caf.rules.RuleException: java.lang.NullPointerException
at com.webmethods.caf.rules.impl.comparator.BaseComparator$EqualsEvaluator.doCompare(BaseComparator.java:108)
at com.webmethods.caf.rules.impl.comparator.BaseComparator.evaluateBoolean(BaseComparator.java:36)
at com.webmethods.caf.rules.impl.logicalOp.BaseLogicalOp.evaluate(BaseLogicalOp.java:28)
at com.webmethods.caf.rules.impl.logicalOp.AndLogicalOp.evaluateBoolean(AndLogicalOp.java:23)
at com.webmethods.caf.rules.impl.logicalOp.BaseLogicalOp.evaluate(BaseLogicalOp.java:28)
at com.webmethods.caf.rules.impl.Rule.evaluateCondition(Rule.java:53)
at com.webmethods.portal.mech.task.impl.TaskRuleHelper.evaluateRule(TaskRuleHelper.java:112)
at com.webmethods.portal.task.events.orchestrator.TaskRulesProcessor.runScheduleHandlerImpl(TaskRulesProcessor.java:190)
at com.webmethods.portal.task.events.orchestrator.TaskRulesProcessor.processScheduleEntry(TaskRulesProcessor.java:112)
at com.webmethods.portal.task.events.orchestrator.TaskOrchestrator.processEntry(TaskOrchestrator.java:308)
at com.webmethods.portal.task.events.orchestrator.TaskOrchestrator$SchedulerEntryProcessor.call(TaskOrchestrator.java:261)
at com.webmethods.portal.task.events.orchestrator.TaskOrchestrator$SchedulerEntryProcessor.call(TaskOrchestrator.java:248)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Hi,

Please check if any Tasks are scheduled incorrectly and deployed to MWS, which might be causing issues in Task Engine.