Error 0x8051000E

Value: -2142175218 | 0x8051000E | 2152792078

What does it mean ?

OPC_E_INVALID_DEFAULT_EXTENSION  
An extension that is provided for a default content type is not valid, because it does not conform to the rules for a part name, specified in the OPC.
Value: 14 | 0x000E | 0b0000000000001110

Where does it come from ?

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

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