CreateDXLImporter DXLIMPORTOPTION_UPDATE_ELSE_CREATE

I am gettign a below error … any Clue???

<?xml version='1.0'?>

document element’s noteinfo unid is already defined: 4DD6DC33D70026B36525744500263C39

document element’s noteinfo unid is already defined: 4DD6DC33D70026B36525744500263C39

document element’s noteinfo unid is already defined: 4DD6DC33D70026B36525744500263C39

document element’s noteinfo unid is already defined: 93AE30941C1B88366525744500263C3B

document element’s noteinfo unid is already defined: 93AE30941C1B88366525744500263C3B

document element’s noteinfo unid is already defined: 93AE30941C1B88366525744500263C3B

document element’s noteinfo unid is already defined: 93AE30941C1B88366525744500263C3B

document element’s noteinfo unid is already defined: 4DD6DC33D70026B36525744500263C39

document element’s noteinfo unid is already defined: 8534D65A85E51BCE65256E59005023EF

document element’s noteinfo unid is already defined: 8534D65A85E51BCE65256E59005023EF

document element’s noteinfo unid is already defined: 8FCFE70BB2141F1F6525744500263C55

document element’s noteinfo unid is already defined: 8FCFE70BB2141F1F6525744500263C55

document element’s noteinfo unid is already defined: 7660A2623E6E3D236525744500263C6E

document element’s noteinfo unid is already defined: 7660A2623E6E3D236525744500263C6E

document element’s noteinfo unid is already defined: 4DD6DC33D70026B36525744500263C39

document element’s noteinfo unid is already defined: 93AE30941C1B88366525744500263C3B

DXL importer operation failed

Due to this aget is getting exception and not able to complte opration.