vCenter adding issue in DP 10.2

Customer has cell manager containing  DP 10.2 and CM OS is HP-UX 11.31.  Now they want to take VM backup through vCenter. So I have added vCenter appliance6.7  using SSO user and PW  in client option.

When I try to add in backup specification under virtual environment , it shown error as attachment.

So need suggestion from expert to solve the issue.