Error 0x80042936

Value: -2147210954 | 0x80042936 | 2147756342

What does it mean ?

VDS_E_VD_NOT_ATTACHED_READONLY  
The requested operation requires that the virtual disk be attached read only.
Value: 10550 | 0x2936 | 0b0010100100110110

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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