Null Reference Exception was Unhandled - vb.net

Question

This is a very simple code. I am just beginning to use vb. Im making a game where you try to solve a puzzle in the least amount of time and least amount of clicks. Every time I debug the program, it highlights the Clicks and FinalTime and says Null Reference Exception was Unhandled. I declared Clicks and FinalTime globally
Public Class Form1
Dim Clicks As Integer = 0 'The variable that counts the number of times you clicked
Dim Time As Integer 'The vairable that holds the time
Dim TimeMin As Integer 'The variable that holds the minutes
Dim TimeSec As Integer 'The variable that holds the seconds
Dim FinalTime As String 'The variable that holds the final time (minutes and seconds)
Dim NumArray() As Integer
Dim NumArray1() As String
Private Sub Times
Time = Time + 1
TimeSec = TimeSec + 1
TimeMin = Convert.ToInt32(TimeSec \ 60)
If Time >= 60 Then
Time = 0
End If
FinalTime = TimeMin & " min " & Time & " seconds"
lblTime.Text = FinalTime
End Sub
Private Sub Record(ByVal NumArray() As Integer, ByVal NumArray1() As String)
For i As Integer = 0 To 1000
NumArray(i) = Clicks 'Problem is here
i = +1
Array.Sort(NumArray)
Next i
lblRecordClicks.Text = NumArray(0) & " Clicks"
For k As Integer = 0 To 1000
NumArray1(k) = FinalTime 'Problem is here
k = +1
Array.Sort(NumArray1)
Next k
lblRecordTime.Text = NumArray1(0)
End Sub

Answer 1

Rule #1. Strings in VB.NET are not the same as Strings in VB6.
In VB6 you can say
Dim text as String
and you would have text = "" initialized
In VB.NET you need
Dim text as String = vbNullString
or
Dim text as New String
The same applies to arrays of string (or any other array)
Dim arr as String() ' This makes arr = Nothing
arr = New String(10) { } ' This allocates an array with 11 items (0..10)
or
Dim arr as String() = New String(10) {}
or
Dim arr() As String = New String(10) {}
or
Dim arr() = New String(10) {}
or
Dim arr = New String(10) {}
See related: Classes and arrays how to initialize?