Error 0x8051001D

Value: -2142175203 | 0x8051001D | 2152792093

What does it mean ?

OPC_E_DS_INVALID_CERTIFICATE_RELATIONSHIP  
A relationship of type digital signature certificate has the external target mode. For more information about this relationship type, see the OPC.
Value: 29 | 0x001D | 0b0000000000011101

Where does it come from ?

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

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