This is vb.net

This code is not working I get this error message >System.ArgumentNullException: 'Value cannot be null. Parameter name: item'

I just want to display in the list box the information that i receive in the textbox

Public Class Form1 Dim i As Integer Dim userInfo(4) As String Private Sub btnSaveUser_Click(sender As Object, e As EventArgs) Handles btnSaveUser.Click 'Dim userInfo(4) As String 'txtUserNamePhone.Text = userInfo(4) 'Dim nombre As String = txtUserNamePhone.Text 'MessageBox.Show(nombre) userInfo(0) = txtUserNamePhone.Text userInfo(1) = txtUserNamePhone.Text userInfo(2) = txtUserNamePhone.Text userInfo(3) = txtUserNamePhone.Text For i = 0 To 4 'osea 0,1,2,3,4 lstDisplay.Items.Add(userInfo(i)) Next End Sub End Class