If then else in QTP

[vs_naveen9]

I was learning parameterization with QTP and encountered problem when i ran my script.

The exact scenario is ..I tried to login with different usernames n third one was an incorrect name. I wrote an If condition to run my script smoothly.
the script looks like this

The first few lines were recorder scripts which would enter user name and password.

Then i wrote the condition

if
Dialog("name:= Flight Reservations").Exist Then
Dialog("name:= Flight reservations").Winbutton("name:=OK").click
Dialog("name:=Login").Winbutton("name:=Close").Click
Else
Window("flight Reservation").Close
End If
End With

This was to close window which popped up as a result of the incorrect username with less than 4 char.

Error was thrown while running the script in the third iteration which would check the THEN condition.

Could anyone please sort this out for me to find out where the exact problem is?