What's wrong with my code?

Objective:
Import the data to navision table from Access table through ADO!

Variables :
varRecordset @Automation 'Microsoft ActiveX Data Objects Recordset 2.8 Library'.Recordset
varFldCollection @Automation 'Microsoft ActiveX Data Objects Recordset 2.8 Library'.Fields
RecordVar @RecordRef
FieldVar @FieldRef

Code:
....
varRecordset.Open (strSql ,StrConnString); // Connection String

REPEAT
varFldCollection := varRecordset.Fields; // Extracting Fields Collection From Recordset and Storing in Fields Collection Object

RecordVar.OPEN(table_ID);
RecordVar.RESET;

FOR i :=1 TO RecordVar.FIELDCOUNT DO BEGIN
FieldVar :=RecordVar.FIELDINDEX (i);
FieldVar.VALIDATE(varFldCollection.Item(i-1).Value);
RecordVar.INSERT; //error occurs!
END;

varRecordset.MoveNext // moving to next record
UNTIL varRecordset.EOF=TRUE ;

Problem:
I can not insert the data which I retrieve from Access tabe into the RecordRef table. But when I use MESSAGE('Value of the field %1 is %2',FieldVar.CAPTION,FieldVar.VALUE); to show the value I can see they have been retrieved. What I want to do is insert the data into Navision table.

guys! any idear?