Put a bar chart into a pdf file generated by ColdFusion

I'm using ColdFusion 8.0 running on a Linux server and a MySql db. I want to generate a pdf file that contains a table of info from the db and also a bar chart. The table is fine, but the bar chart isn't displaying. Here's my chunk of code for the chart:

<cfchart format="flash"
         yaxistitle="% yield"
         chartwidth="640"
         chartheight="480">
            <cfchartseries type="horizontalbar"
                           query="bar_info"
                           valuecolumn="col1"
                           itemcolumn="col2">                          
</cfchart>
</cfdocument>

<cfpdf action="write"
       source="hreport"
       destination="createreportPDF.pdf" overwrite="yes"/>
      
<cfpdf name="pdf" action="read" source="createreportPDF.pdf"/>

Any suggestions much appreciated. Thank you.