.net - 'Object reference not set to an instance of an object error'

I keep getting an 'Object reference not set to an instance of an object' error when trying to navigate with Gecko. One of the suggestions is to use the New keyword. But where and why?

Dim wbGecko As New GeckoWebBrowser
Dim i As Integer = 0
For i = 0 To lstPosts.Count - 1
    wbGecko.Navigate("http://websta.me" & lstPosts.Item(i))
    Do
        If Not (wbGecko.IsBusy) Then
            MessageBox.Show("Hello World!")
        End If
        Exit Do

    Loop
    Exit For
Next