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I have some problem to implement twig extension. I need to create my own filter (a substr filter). So I have thought to use twig extension. I created a folder named "Extension" on MyApp\Bundle\WebsiteBundle\ and file : WebsiteExtension.php namespace Bundle\WebsiteBundle\Extension; class WebsiteExtension extends \Twig_Extension { public function getFilters() { return array( 'substr' => new \Twig_Filter_Method($this, 'substrFilter'), ); } public function substrFilter($sentence, $start, $end) { return substr($sentence, $start, $end); } public function getName() { return 'website_extension'; } } Then on my config.yml on /app/config services: Website.twig.extension: class: MyApp\Bundle\WebsiteBundle\Extension\WebsiteExtension tags: - { name: twig.extension } But error occurs : "Fatal error: Class 'MyApp\Bundle\WebsiteBundle\Extension\WebsiteExtension' not found in .../appDevDebugProjectContainer.php on line 1391" It's strange because file and class exists ... I have missed something but what ?

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