String declaration Error or "With B4R I always feel like a noob!"

Hi Guys...

Why does this code give an error?

Code:

  'in Globals:
Private XDirection as string

'In AppStart:
Dim x = Rnd(0,2) As Int
If x = 0 Then
         XDirection = "Up"
Else
         XDirection = "Down"
End If  

I get this warning:


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