Error 0x80510030

Value: -2142175184 | 0x80510030 | 2152792112

What does it mean ?

OPC_E_DS_REFERENCE_MISSING_CONTENT_TYPE  
The URI attribute value of a Reference element in the signature markup does not include the content type of the referenced part.
Value: 48 | 0x0030 | 0b0000000000110000

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