Error 0x80510003

Value: -2142175229 | 0x80510003 | 2152792067

What does it mean ?

OPC_E_RELATIONSHIP_URI_REQUIRED  
The part name of a Relationships part is required, but the part name is not that of a Relationships part. For more information about the part names of Relationships parts, see the OPC.
Value: 3 | 0x0003 | 0b0000000000000011

Where does it come from ?

FACILITY_OPC  
Open Connectivity Service (Package Consumption)
Value: 81 | 0x051 | 0b01010001

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Other Errors for FACILITY_OPC