Warning: Invalid argument supplied for foreach() in /var/www/eiffel/src/EiffelBundle/Api/Client.php on line 72

Fatal error: Uncaught RuntimeException: Failed to start the session because headers have already been sent by "/var/www/eiffel/src/EiffelBundle/Api/Client.php" at line 72. in /var/www/eiffel/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php:150 Stack trace: #0 /var/www/eiffel/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php(321): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() #1 /var/www/eiffel/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/Session/Session.php(256): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->getBag('flashes') #2 /var/www/eiffel/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/Session/Session.php(268): Symfony\Component\HttpFoundation\Session\Session->getBag('flashes') #3 /var/www/eiffel/vendor/twig/twig/src/Template.php(700): Symfony\Component\HttpFoundation\Session\Session->getFlashBag() #4 /var/www/eiffel/var/cache/prod in /var/www/eiffel/src/AppBundle/Resources/views/layout.html.twig on line 185