title: What is "Label Not define" in my VBA code?
body: <p>I have the VBA code in MS Access</p>
  
  <pre><code>Private Sub ToolingNoID_AfterUpdate()
  On Error GoTo ToolingNoID_AfterUpdate_Err
  
  Dim ToolingNoID As String
  ToolingNoID = InputBox("Please enter Tooling No", "Enter Tooling No")
  
  If (IsNull(ToolingNoID)) Then
      Exit Sub
      Beep
      MsgBox "Please enter the tooling number.", vbOKOnly, ""
      DoCmd.CancelEvent
  End If
  
  End Sub
  </code></pre>
  
  <p>The offence line is </p>
  
  <pre><code>Private Sub ToolingNoID_AfterUpdate()
  </code></pre>
  
  <p>I really have no idea which part of my code should be changed to fufill the above condition. Anyone can help me on this?</p>