Error 0x887C0028

Value: -2005139416 | 0x887C0028 | 2289827880

What does it mean ?

AEERR_ENDPOINT_ALREADY_ATTACHED  
Connection already attached to an endpoint.
Value: 40 | 0x0028 | 0b0000000000101000

Where does it come from ?

FACILITY_DIRECT3D11  
Direct3D 11
Value: 2172 | 0x87C | 0b100001111100

Other Errors for FACILITY_DIRECT3D11