PHP DrawReferenceMap

[Berend Veldkamp]

Do I need something special to get DrawReferenceMap going in PHP? When I
do
$map->drawReferenceMap();
All I get is:
Fatal error:  MapServer Error in msDrawReferenceMap(): Unable to
initialize image. in refmap.php on line 4

(Line 4 = $map->drawReferenceMap();)

Berend

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