include un grafico fatto con phpgraphlib

[lupo92]

salve a tutti ho questo grafico

<?php
include('phpgraphlib.php"');
$graph = new PHPGraphLib(800,600);
$data = array("Roger"=>145, "Ralph"=>102);
$graph->setBackgroundColor("black");
$graph->addData($data);
$graph->setBarColor('255,255,204');
$graph->setTitle('IQ Scores');
$graph->setTitleColor('white');
$graph->setupYAxis(12, 'white');
$graph->setupXAxis(20, 'white');
$graph->setGrid(false);
$graph->setGradient( 'aqua', 'blue');
$graph->setBarOutlineColor('white');
$graph->setTextColor('white');
$graph->setDataPoints(true);
$graph->setDataPointColor('purple');
$graph->setLine(true);
$graph->setLineColor('lime');
$graph->createGraph();
?>

Il grafico dfunziona ma se tento di inserire anche solo una lettera es. print "lupo"; mi da errore