Error "91" while trying IE automation

[bodis]

Hi,

I am playing with IE automation but keep receiving error 91 on the following block:

Set UserN = appIE.Document.getElementsByName("username")
If Not UserN Is Nothing Then
    UserN(0).Value = "login name"
End If

The error occurs on this line:

UserN(0).Value = "login name"

I am pretty sure the solution is simple, I just lack the knowledge to see where it is.

Many Thanks

Bod