[phpOpenTracker-User] all_paths API problem

I'm trying to use the all_path API example from the documentation but I 
am running into an error message:

<?php
require 'phpOpenTracker.php';

$graph = phpOpenTracker::get(
   array(
     'api_call'      => 'all_paths',
     'result_format' => 'graphviz_object',
   )
);

$graph->image('png');
?>

The browser outputs an image with the following text in it:

The image "http://192.168.255.12/test.php" cannot be displayed, because 
it contains errors.


What is causing this and what do I need to do to get the all_paths API 
to work?


Thanks,

Jean-Christian Imbeault





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