Large amounts of "wt.fc.ObjectNoLongerExistsException" are written into MethodServer log file when accessing Home page to view completed WrokItems with the deleted Primary Business Objects in Windchill PDMLink

• Large amounts of ObjectNoLongerExistsException as below are written into MethodServer log file when accessing Home page to view completed WrokItems with the deleted Primary Business Objects
• Large amounts ObjectNoLongerExistsException as below are written into MethodServer log file when access the Process Manager for first time
• The error message in MethodServer log file is

wt.util.WTRuntimeException: Object "wt.doc.WTDocument>######" is not persistent. Nested exception is:
 (wt.fc.fcResource/7) wt.fc.ObjectNoLongerExistsException: Object "wt.doc.WTDocument>######" is not persistent.

INFO [ajp-bio-8010-exec-5] wt.system.out Administrator - wt.util.WTRuntimeException: Cannot restore "wt.workflow.robots.WfTimerActivity.####" because it no longer exists. 

• When a specific user is logging into Windchill, the following errors will be observed in the MethodServer log

wt.util.WTRuntimeException: Object "wt.change2.WTChangeOrder2>1843486" is not persistent. Nested exception is:
    (wt.fc.fcResource/7) wt.fc.ObjectNoLongerExistsException: Object "wt.change2.WTChangeOrder2>1843486" is not persistent.
    at wt.vc.StandardVersionControlService.refresh(StandardVersionControlService.java:3200)
    at sun.reflect.GeneratedMethodAccessor416.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at wt.services.ServiceFactory$ServerInvocationHandler.invoke(ServiceFactory.java:399)
    at com.sun.proxy.$Proxy53.refresh(Unknown Source)
    at wt.fc.DefaultInflator$VfkCache.inflate(DefaultInflator.java:444)
    at wt.fc.DefaultInflator$VfkCache.inflate(DefaultInflator.java:436)
    at wt.fc.DefaultInflator$AbstractCache.get(DefaultInflator.java:291)
    at wt.fc.DefaultInflator$AbstractCache.get(DefaultInflator.java:259)
    at wt.fc.DefaultInflator.get(DefaultInflator.java:171)
    at wt.vc.VersionReference.getObject(VersionReference.java:123)
    at wt.vc.VersionReference.getObject(VersionReference.java:60)
    at wt.fc.PersistentReference.refresh(PersistentReference.java:217)
    at wt.fc.PersistentReference.getObject(PersistentReference.java:95)
    at com.ptc.windchill.enterprise.work.assignmentslist.server.CachedAttrForAssignments.getFromSourceCache(CachedAttrForAssignments.java:405)
    at com.ptc.windchill.enterprise.work.assignmentslist.dataUtilities.AssignmentsTableImageDataUtility.getDataValue(AssignmentsTableImageDataUtility.java:221)
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• How to prevent this kind of log output
• When click tasks from My Tasks table will show You do not have access to this object or it does not exist