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I noticed this error as well. Once thing that should be
noted is that you have to have php notice errors turned on
in you php.ini file. The output form php is:

<br />
<b>Notice</b>: Undefined variable: m_withLegend in
<b>/home/mike/public_html/chart/panachart.php</b> on line
<b>236</b><br />

Since it is a notice message, you won't see it unless the
E_NOTICE flag is set in the error_reporting option.