simple(?) VBA help

simple(?) VBA help

I am getting the message "Encountered error at line 9 :Invalid arguments: Object required" when I try to run the macro below, which I copied from  http://www.mrexcel.com/forum/showpost.php?s=4ab5add6c1156e7e667e8fe62208e2e3&p=266170&postcount=3.  Can anyone explain why? 

Public Sub main()
  Dim oRange As Range
 Dim oComment As Comment
 Dim sText As String
 
 'Use object variable to hold range. In this example Sheet1 Cell A1
 Set oRange = Sheets("Sheet1").Range("A1")
 'Use object variable for comment
 Set oComment = oRange.Comment
 'text to be added to the comment box
 sText = "Hello"
 
 'If Sheet1 Cell A1 has a comment then append "Hello" to the end of the comment text
 If Not oComment Is Nothing Then
 sText = oComment.Text & sText
 oRange.Comment.Delete
 End If

 'Add a comment with the contents of sText
 oRange.AddComment sText
End Sub





















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