how to insert error msg in a datatable using Dp?

[zakshah.12]

Code:

Dim bro,url

bro = "iexplore"
url = "www.gmail.com"

systemutil.Run bro,url

For i = 1 To datatable.GetRowCount Step 1

Set desc=description.Create
          desc("micclass").value="WebEdit"
          desc("html id").value="Email"
          Browser("title:=.*").Page("title:=.*").WebEdit(desc).Set datatable("user")

Set desc1=description.Create
          desc1("micclass").value="WebEdit"
          desc1("name").value="Passwd"
          Browser("title:=.*").page("title:=.*").webEdit(desc1).Set datatable("pass")

Set desc2=description.Create
desc2("micclass").value="WebButton"
desc2("class").value="g-button g-button-submit"
Browser("title:=.*").page("title:=.*").webbutton(desc2).Click



If browser("title:=.*").page("title:=.*").webbutton(desc2).Exist(2) Then
   Set desc3=description.Create
   desc3("micclass").value="WebElement"
   desc3("class").value="errormsg"
    else

End If

datatable.SetNextRow
next

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i am using dp and trying to create output check point using dp.
so that error msg can be record in the datatable?