Hello
from my point of view this is a error due lack or hardware resources, you can check those links.
http://www.symantec.com/business/support/index?page=content&id=TECH207801
https://support.software.dell.com/kb/SOL14674
Anyway error message is received from VDI API seems to be clear that issue is out of DP scope, please follow link recommendations and try to run backup again.