Error 0x8051000C

Value: -2142175220 | 0x8051000C | 2152792076

What does it mean ?

OPC_E_INVALID_OVERRIDE_PART_NAME  
The part name that is used as the value of the PartName attribute of an Override element in the Content Types stream does not conform to the rules for a valid part name, specified in RFC 3986: URI Generic Syntax (http://go.microsoft.com/fwlink/p/?linkid=143950) and the OPC. For more information about Override elements, see the OPC.
Value: 12 | 0x000C | 0b0000000000001100

Where does it come from ?

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

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