Not able to update a table in VBA Access code

[Arasi]

Hi all,
I am a beginner in Access VBA.
I have an issue in updating a Table in the VBA code.

I am reading a text file in this VBA code and extracting the message IDs from the file and write some comment for the message ID.
I am trying to update the message ID and the comment to the Table "Result" using the below code. It is giving me Run time error - 3001. Invalid Argument.
it stops at the line Rslt.Update.

Dim db As Database
Dim Rslt As Recordset
Set db = CurrentDb()
Set Rslt = db.OpenRecordset("Result")
Rslt.AddNew
Rslt("Field1") = msg_id
Rslt("Field2") = comment
Rslt.Update

Please some one help me to overcome this. It was working fine before. Now its giving error. Donno where I ve gone wrong.

Thanks,
Arasi