FATAL ERROR WITH REFERENCEMAPOBJECT

[Philippe Gondek]

Fatal error: [MapServer Error]: msImageLoadGD():
(/var/www/htdocs/miam/regions.png) in
/var/www/localhost/htdocs/miam/monscript.php on line 157

That's the error...

And that is th e way I do :

$mapref=$map->reference;

$mapref->set("image","/var/www/htdocs/miam/regions.png");
$mapref->extent->minx = $xmin;
$mapref->extent->miny = $ymin;
$mapref->extent->maxx = $xmax;
$mapref->extent->maxy = $ymax;

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$image3=$map->drawReferenceMap();
$ScaleBar_url = $image3->saveWebImage();

Am I wrong ???

Thank you...