title: Combo box getting "Enter Parameter Value" prompt when clicking a button
body: <p>Any ideas why I am getting an "Enter Parameter Value" input box when running this code?</p>
  
  <pre><code>Private Sub cmdPrint_Click()
      Dim str As String
      On Error GoTo ErrHandler
      If IsNull(Me.Combo_1) Then
          MsgBox "Can't print an unsaved record", _
          vbOKOnly, "Error"
          Exit Sub
      End If
      str = "Combo_1 = '" &amp; Me!Combo_1 &amp; "'"
      Debug.Print str
      DoCmd.OpenReport "rptBarCodeLabels(2)", acViewPreview, , str
      Exit Sub
  ErrHandler:
      MsgBox Err.Number &amp; ": " _
      &amp; Err.Description, vbOKOnly, "Error"
  End Sub
  </code></pre>
  
  <p>Edit: The button is being used to print a label of what's currently selected in Combo_1. Once the print button has been clicked, I wanted it to display the single record I chose in the label report I have it referencing. I am using Access 2003 if that means anything.</p>