String.Split Method - The Error Is Occuring Only At Run-time?

I'm trying to use this overload

Split(ParamArray separator() As Char, count As Integer) As String()

However, when I use this

Dim tokens() As String = e.Node.Text.Split(New Char() {":"c}, 2)

I'm getting the ArgumentException (Illegal enum value: 2)

I tried using named arguments with no effect:

Dim tokens() As String = e.Node.Text.Split(New Char() {":"c}, count:=2)

Using this overload didn't weed out the error either:

Dim tokens() As String = e.Node.Text.Split(New Char() {":"c}, count:=2, options:=StringSplitOptions.None)

The error is occuring only at run-time. Intellisense swallows it without problem.