Error 0x80045066

Value: -2147200922 | 0x80045066 | 2147766374

What does it mean ?

SPERR_RECOXML_GENERATION_FAIL  
The Recognition Parse Tree couldn't be genrated. For example, that the rule name begins with a digit. XML parser doesn't allow element name beginning with a digit.
Value: 20582 | 0x5066 | 0b0101000001100110

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

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