The VM backup is failing with the error code 10026

The errors and exceptions in the Log are mentioned below.

2018-11-27 18:01:50 avvcbimage FATAL <5889>: Fatal signal 11 in pid 25856 (Log #2)
2018-11-27 18:01:50 avvcbimage FATAL <5890>: handlefatal: Aborting program with code 176, pid=25856, sig=11 (Log #2)
2018/11/27-18:01:50.53560 VcbImageBackupAssistThread DEBUG-FATAL ERROR <0001> uapp::handlefatal: Fatal signal 11 (Log #2)
2018/11/27-18:01:50.53583 VcbImageBackupAssistThread DEBUG-ERROR <0001> uapp::handlefatal: aborting program pid=25856, sig=11 (Log #2)

Could someone please advise how to troubleshoot this failure? What could be the cause?

Thank you!