how to solve "Collection index must be in the range 1 to the size of the collection"?

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VB

VS2010

when i run the code and after going through two forms i select item from one list box and another item from another listbox and click on land button. after that i get an error saying "Collection index must be in the range 1 to the size of the collection."

Private Sub btn_land_plane_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_land_plane.Click<br />
<br />
        Dim runwayindexno As Integer<br />
        Dim runwayfrmselected As Form<br />
        runwayindexno = lst_runways.SelectedIndex<br />
        runwayfrmselected = runway(runwayindexno)<br />
<br />
    End Sub

It highlight [==runway(runwayindexno)] and displays the error.

i have looked for the solution cant find one that relates to my code. i don't know how much code
to include if need i can post.
if you need any more information please ask and any help is much appreciated.