Fatal error: Uncaught InvalidArgumentException: Identifier "isMobile" is not defined. in /home/saitas.net/vendor/pimple/pimple/lib/Pimple.php:78 Stack trace: #0 /home/saitas.net/public_html/index.php(195): Pimple->offsetGet('isMobile') #1 [internal function]: {closure}(Object(Twig\Error\RuntimeError), 500) #2 /home/saitas.net/vendor/silex/silex/src/Silex/ExceptionListenerWrapper.php(53): call_user_func(Object(Closure), Object(Twig\Error\RuntimeError), 500) #3 [internal function]: Silex\ExceptionListenerWrapper->__invoke(Object(Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent), 'kernel.exceptio...', Object(Symfony\Component\EventDispatcher\EventDispatcher)) #4 /home/saitas.net/vendor/symfony/event-dispatcher/EventDispatcher.php(174): call_user_func(Object(Silex\ExceptionListenerWrapper), Object(Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent), 'kernel.exceptio...', Object(Symfony\Component\EventDispatcher\EventDispatcher)) #5 /home/saitas.net/vendor/symfony/event-dispatcher/EventDispatcher.ph in /home/saitas.net/vendor/pimple/pimple/lib/Pimple.php on line 78