what cause the Mergesort come out this kind of probelm

F419 is Mergesort object.i do not know why come out this kind of problem.and what the print mean ?

time: 570077.605418exception: Exception caught in eventlogmanager::logevent()
time: 570077.605418exception: Exception caught in linkedlist::receivemessage()
time: 570077.605418exception: int moveobject(...)
time: 570077.605418exception: Exception Caught in FixedResource:ushitem(fsnode * item, FixedResource* otherobject, int port, int otherport) object: /kuangchangjiaodaiji/F419
time: 570077.605418exception: Exception Caught in FixedResource:utopenevent(FixedResource* otherobject, int search, int port, int otherport) object: /kuangchangjiaodaiji/F419
time: 570077.605418exception: Exception Caught in MergeSort::frrelease(fsnode* item, int port) object: /kuangchangjiaodaiji/F419
time: 570077.605418exception: Exception Caught in MergeSort::OnTimerEvent(fsnode *involved, int code, char *datastr) object: /kuangchangjiaodaiji/F419
time: 570077.605418exception: Exception Caught in ObjectFunction201__project_library_FlexsimObject_b ehaviour_eventfunctions_OnTimerEvent object: /kuangchangjiaodaiji/F419 i: /kuangchangjiaodaiji/F419>variables/sortedtable/14 class: /kuangchangjiaodaiji/F419