Error 0x8051004C

Value: -2142175156 | 0x8051004C | 2152792140

What does it mean ?

OPC_E_MC_INCONSISTENT_PRESERVE_ELEMENTS  
The PreserveElements attribute does not have a matching Ignorable attribute on the same element.
Value: 76 | 0x004C | 0b0000000001001100

Where does it come from ?

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

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