VB.NET Code compiles fine on system IDE, but fails on online IDE

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VB

errors

I have the following code which generates an array of numbers from 0-10. I am using SharpDevelop IDE and it compiles and runs just fine. However, i need the code to run on ideone.com. Over there i get an error "error VBNC30451: 'ArrayList' is not declared. It may be inaccessible due to its protection level.", I have no idea where i went wrong, any suggestions or fixes?

Module Module1

    Sub Main()
    	
        makeArray(10,0,10)
        Do Until (Console.ReadKey.Key = ConsoleKey.Escape)
        
Loop
        
    End Sub 

    Public Function randomNum(ByVal high As Integer, ByVal low As Integer) As Integer
    	Dim randomValue As Integer
 		randomValue = CInt(Math.Floor((high - low + 1) * Rnd())) + low
 		return randomValue
    End Function 
    
    
    Public Function checkExist(ByVal numbers() As Integer,ByVal searchval As Integer,ByVal size As Integer ) As Integer
    	For value As Integer =0 To size
    		If searchval = numbers(value) Then
    		'	Console.WriteLine("found")
    			Return 3
    		End If
    	Next
    	Return 4
    End Function 
    
    
    
    public Function makeArray(ByVal high As Integer, ByVal low As Integer, ByVal size as Integer) as String()
    	Dim count as Integer
    	Dim random As Integer
    	Dim arra As New ArrayList()
    	Dim dif = size-1
	
	' Dim arra As Integer() = New Integer(19) {}
	'Dim arra(20) As Integer
	For index As Integer = 0 To size+9
    	random =(randomNum(10,0))
    	if Not (arra.Contains(random)) Then
    		count = count +1
    		'Console.writeline("Already contains generating new number")
    		random = randomNum(10,0)
    		while (arra.Contains(random) = true)
    			random = randomNum(10,0)
    		End While	
    	End If
    	If arra.Contains(random) = false
    		arra.add(random)
    		End If
    		
    		Next
    			'Console.WriteLine(count)
    			For Each item As String In arra
    Console.WriteLine(item)
Next
    
    
    End Function

End Module