i type everything right for hands on chapter 41 but i cant s

i type everything right for hands on chapter 4-1 but i cant seem to get the program to get the error message to display

Here you can display error

<HTML>
   <SCRIPT LANGUAGE=\"VBScript\" RUNAT=\"Server\">
   Private Function verify(sISBN)
   End Function

</SCRIPT>
   <BODY>
       <H2><CENTER>ERROR DISPLAY</CENTER></H2>
       <p>Title: ERROR</P>
       VAL:
       <%
       val = Request.Form(\"isbnVal\")
       If Not verify(val) Then
           Response.Write \"The ISBN entered is wrong.\"
       Else
           Response.Write val
       End If
       %>
   </BODY>
</HTML>

i type everything right for hands on chapter 4-1 but i cant seem to get the program to get the error message to displaySolutionHere you can display error <HT

i type everything right for hands on chapter 41 but i cant s

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