Warning: require_once(jpgraph_glayout_vh.inc.php) [function.require-once]: failed to open stream: No such file or directory in C:\xampp\htdocs\jpgraph\jpgraph_windrose.php on line 12

Fatal error: require_once() [function.require]: Failed opening required 'jpgraph_glayout_vh.inc.php' (include_path='.;C:\xampp\php\PEAR') in C:\xampp\htdocs\jpgraph\jpgraph_windrose.php on line 12