Hi, Check following things.
1) Make sure there is no backup running, remove the node from the policy and delete the node from ARCserve Central Applications Host-Based VM.
2) Delete any existing snapshot for the Virtual Machine
3) Disable Changed Block Tracking (CBT) on virtual machine, refer the below VMware KB for detailed steps:
3) If the problem still persist , you can remove the Virtual Machine from inventory of vCenter and add it back. Refer the below VMware KB for detailed steps: