What's wrong with my calling signature?

[RogerSSB]

I have a subroutine defined as follows:

<System.Runtime.CompilerServices.Extension>
Public Sub MoveItself(Of T As Control)(ByVal ctrl As T)
<code>
End Sub

but when I call it like this:

MoveItself(MyControl)

I get this error message:

BC36582 Too many arguments to extension method 'Public Sub MoveItself()

Why?

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