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Fatal error: Uncaught RuntimeException: Failed to start the session because headers have already been sent by "/home/concrete-pump/app/src/Controllers/CustomerController.php" at line 111. in /home/concrete-pump/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:140 Stack trace: #0 /home/concrete-pump/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php(278): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() #1 /home/concrete-pump/vendor/symfony/http-foundation/Session/Session.php(237): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->getBag('flashes') #2 /home/concrete-pump/vendor/symfony/http-foundation/Session/Session.php(247): Symfony\Component\HttpFoundation\Session\Session->getBag('flashes') #3 /home/concrete-pump/app/src/Providers/MinimalTemplateServiceProvider.php(66): Symfony\Component\HttpFoundation\Session\Session->getFlashBag() #4 /home/concrete-pump/app/src/Controllers/CustomerController.php(56): ConcretePump\Providers\M in /home/concrete-pump/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php on line 140