Error 0x80042934

Value: -2147210956 | 0x80042934 | 2147756340

What does it mean ?

VDS_E_VD_ALREADY_ATTACHED  
The virtual disk is already attached.
Value: 10548 | 0x2934 | 0b0010100100110100

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

StackOverflow

Other Errors for FACILITY_ITF