vss fail on server 2008 r2

hi i have this error with vss

Volume Shadow Copy Service error: Unexpected error calling routine CLSIDFromString({00000001-0000-0000-0007-000000000001}).  hr = 0x80070002, The system cannot find the file specified.

.

Operation:

   Query Shadow Copies

Context:

   Execution Context: Coordinator

how to fix this

thanks yaniv