DMF creation error

Hi all,

Please help me in this error ,I am actually working on some data upload through DMF. 

TreeNode objet non initialisé.

Suivi de la pile

(S)\Data Dictionary\Tables\DMFTargetXMLToEntityMap\Methods\insertDataGroup - line 26
(S)\Data Dictionary\Tables\DMFTargetXMLToEntityMap\Methods\generateMapping - line 54
(S)\Data Dictionary\Tables\DMFEntity\Methods\Insert - line 35
(S)\Classes\xRecord\dbOpInTransaction
(C)\Classes\FormDataSource\write
(C)\Classes\FormDataSource\leaveRecord
(C)\Classes\FormRun\task
(C)\Classes\SysSetupFormRun\task - line 27

Thanks,

Dhia.