Imprimer sa commande en PDF

( ! ) Fatal error: Class 'JFolder' not found in C:\wamp\www\domaine\libraries\joomla\document\pdf\pdf.php on line 164
Call Stack
#	Time	Memory	Function	Location
1	0.0004	245024	{main}( )	..\index.php:0
2	0.0487	3609856	JApplicationCms->execute( )	..\index.php:45
3	0.0487	3610056	JApplicationSite->doExecute( )	..\cms.php:252
4	0.0866	6782936	JApplicationSite->route( )	..\site.php:215
5	0.0866	6783064	JApplicationCms->route( )	..\site.php:763
6	0.1340	10677256	JApplicationBase->triggerEvent( )	..\cms.php:1098
7	0.1340	10677304	JEventDispatcher->trigger( )	..\base.php:106
8	0.1340	10677840	JEvent->update( )	..\dispatcher.php:160
9	0.1340	10678296	call_user_func_array:{C:\wamp\www\domaine\libraries\joomla\event\event.php:69} ( )	..\event.php:69
10	0.1340	10678568	PlgSystemSef->onAfterRoute( )	..\event.php:69
11	0.1340	10678648	JFactory::getDocument( )	..\sef.php:29
12	0.1341	10678800	JFactory::createDocument( )	..\factory.php:216
13	0.1360	10839264	JDocument::getInstance( )	..\factory.php:739
14	0.1369	10956752	JDocumentPDF->__construct( )	..\document.php:311

// verify and load the PDF class and assign by ref the jdocument
		if ($type === null) $type = $this->params->get('engine','mpdf');
		if(!file_exists(JPATH_LIBRARIES.'/'.$type)) {
			// reset type & fallback to installed PDF classes
			$type = null;
			$renderers = JFolder::files(dirname(__FILE__) . '/renderer/' , '\.php$');
			foreach ($renderers as $renderer) {
				$lib = substr($renderer, 0, -4) ;
				if (file_exists(JPATH_LIBRARIES.'/'.$lib) ) {
					$type = $lib ;
					break;
				}
			}
		}

Fatal error: Class 'JDocument' not found in C:\wamp\www\domaine\libraries\joomla\factory.php on line 739
Call Stack
#	Time	Memory	Function	Location
1	0.0003	241216	{main}( )	..\index.php:0
2	0.0381	3600584	JApplicationCms->execute( )	..\index.php:45
3	0.0381	3600784	JApplicationSite->doExecute( )	..\cms.php:252
4	0.0855	6775312	JApplicationSite->route( )	..\site.php:215
5	0.0855	6775440	JApplicationCms->route( )	..\site.php:763
6	0.1098	8366520	JApplicationBase->triggerEvent( )	..\cms.php:1098
7	0.1098	8366568	JEventDispatcher->trigger( )	..\base.php:106
8	0.1098	8367104	JEvent->update( )	..\dispatcher.php:160
9	0.1098	8367560	call_user_func_array:{C:\wamp\www\domaine\libraries\joomla\event\event.php:69} ( )	..\event.php:69
10	0.1098	8367832	PlgSystemSef->onAfterRoute( )	..\event.php:69
11	0.1098	8367912	JFactory::getDocument( )	..\sef.php:29
12	0.1099	8368064	JFactory::createDocument( )	..\factory.php:216