Javascript runtime error able to get property its either undefined or null reference .

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VB

Javascript

Oracle

I am getting a javascript runtime error for a property it says
JavaScript runtime error: Unable to get property 'AUTH_ERP_UI_AUTHORIZATION_DETAIL_ID' of undefined or null reference

Can anybody help me for the solution for this error.

Below is my code for javascript.

 If  UserType = "C" Then
                        strBuilder.Append(RSmartUtl.DumpingAuthFromPopup(Page, CompID,     Trim(e.Item.Cells(31).Text), UserID, 584, "deductInstruction_form", False))


   strBuilder.Append("window.opener.document.deductInstruction_form.AUTH_ERP_UI_AUTHORIZATION_DETAIL_ID.value='';" & vbCrLf)
                        strBuilder.Append("window.opener.document.deductInstruction_form.AUTH_USER_GROUP_ID.value='';" & vbCrLf)
                        strBuilder.Append("window.opener.document.deductInstruction_form.AUTH_USER_NAME.value='';" & vbCrLf)
                        strBuilder.Append("window.opener.document.deductInstruction_form.AUTH_USER_GROUP_TYPE.value='';" & vbCrLf)
                        
End if

after this ir returns 
window.opener.document.deductInstruction_form.AUTH_ERP_UI_AUTHORIZATION_DETAIL_ID.value=unescape('3036');
window.opener.document.deductInstruction_form.AUTH_USER_GROUP_ID.value=unescape('1');
window.opener.document.deductInstruction_form.AUTH_USER_NAME.value=unescape('cmc');
window.opener.document.deductInstruction_form.AUTH_USER_GROUP_TYPE.value=unescape('U');