Error 0x8004291D

Value: -2147210979 | 0x8004291D | 2147756317

What does it mean ?

VDS_E_SHRINK_LUN_NOT_UNMASKED  
The SHRINK operation against the selected LUN cannot be completed. The LUN is not unmasked to the local server.
Value: 10525 | 0x291D | 0b0010100100011101

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

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