Issues in Dell PowerVault Tl2000

I've tried to run robtest (Symantec net backup 7.5.0.6)  and got this message

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C:\Program Files\Veritas\Volmgr\bin>robtest
Configured robots with local control supporting test utilities:
TLD(0) robotic path = MISSING_PATH:00X2U78Z0782_LL0

Robot Selection
---------------
1) TLD 0
2) none/quit
Enter choice: 1
1

Robot selected: TLD(0) robotic path = MISSING_PATH:00X2U78Z0782_LL0

Invoking robotic test utility:
C:\Program Files\Veritas\Volmgr\bin\tldtest.exe -rn 0 -r MISSING_PATH:00X2U78Z0782_LL0

Opening MISSING_PATH
Error retrieving credentials for NDMP robot host MISSING_PATH.
Robotic test utility C:\Program Files\Veritas\Volmgr\bin\tldtest.exe
returned abnormal exit status (0).