Object reference not set to an instance of an object.

[alain250sxf]

I got this error from this code:

ERROR:
An unhandled exception of type 'System.NullReferenceException' occurred in Lap Time Analyser.exe

Additional information: Object reference not set to an instance of an object.

CODE:

Private Sub btnplusminus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnplusminus.Click
        Dim laptime() As String
        Dim i, num As Integer
        Dim sr As IO.StreamReader = IO.File.OpenText(path)
        Do While (sr.Peek <> -1)
            sr.ReadLine()
            num += 1
        Loop
        sr.Close()
        Dim srr As IO.StreamReader = IO.File.OpenText(path)
        For i = 1 To num
            laptime(i) = srr.ReadLine
        Next
        srr.Close()
    End Sub

Im thinking its the laptime(i) that is screwing up because that is where it stops in the debugging tool. Help PLZ

My file looks like :

Alain
Ste-Julie
03
02
21
4/18/2006 5:25:14 PM