RuntimeException:
Failed to start the session because headers have already been sent by "/home/sicrtta/pdr/vendor/symfony/http-foundation/Response.php" at line 368.

  at /home/sicrtta/pdr/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:152
  at Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start()
     (/home/sicrtta/pdr/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:323)
  at Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->getBag('attributes')
     (/home/sicrtta/pdr/vendor/symfony/http-foundation/Session/Session.php:249)
  at Symfony\Component\HttpFoundation\Session\Session->getBag('attributes')
     (/home/sicrtta/pdr/vendor/symfony/http-foundation/Session/Session.php:271)
  at Symfony\Component\HttpFoundation\Session\Session->getAttributeBag()
     (/home/sicrtta/pdr/vendor/symfony/http-foundation/Session/Session.php:73)
  at Symfony\Component\HttpFoundation\Session\Session->get('_locale', 'ar_MA')
     (/home/sicrtta/pdr/src/EventSubscriber/LocaleSubscriber.php:31)
  at App\EventSubscriber\LocaleSubscriber->onKernelRequest(object(RequestEvent), 'kernel.request', object(TraceableEventDispatcher))
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/Debug/WrappedListener.php:126)
  at Symfony\Component\EventDispatcher\Debug\WrappedListener->__invoke(object(RequestEvent), 'kernel.request', object(TraceableEventDispatcher))
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/EventDispatcher.php:264)
  at Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(array(object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener)), 'kernel.request', object(RequestEvent))
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/EventDispatcher.php:239)
  at Symfony\Component\EventDispatcher\EventDispatcher->callListeners(array(object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener)), 'kernel.request', object(RequestEvent))
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/EventDispatcher.php:73)
  at Symfony\Component\EventDispatcher\EventDispatcher->dispatch(object(RequestEvent), 'kernel.request')
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php:168)
  at Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher->dispatch(object(RequestEvent), 'kernel.request')
     (/home/sicrtta/pdr/vendor/symfony/http-kernel/HttpKernel.php:134)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), 2)
     (/home/sicrtta/pdr/vendor/symfony/http-kernel/HttpKernel.php:80)
  at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), 2, false)
     (/home/sicrtta/pdr/vendor/symfony/http-kernel/EventListener/ExceptionListener.php:61)
  at Symfony\Component\HttpKernel\EventListener\ExceptionListener->onKernelException(object(ExceptionEvent), 'kernel.exception', object(TraceableEventDispatcher))
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/Debug/WrappedListener.php:126)
  at Symfony\Component\EventDispatcher\Debug\WrappedListener->__invoke(object(ExceptionEvent), 'kernel.exception', object(TraceableEventDispatcher))
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/EventDispatcher.php:264)
  at Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(array(object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener)), 'kernel.exception', object(ExceptionEvent))
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/EventDispatcher.php:239)
  at Symfony\Component\EventDispatcher\EventDispatcher->callListeners(array(object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener), object(WrappedListener)), 'kernel.exception', object(ExceptionEvent))
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/EventDispatcher.php:73)
  at Symfony\Component\EventDispatcher\EventDispatcher->dispatch(object(ExceptionEvent), 'kernel.exception')
     (/home/sicrtta/pdr/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php:168)
  at Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher->dispatch(object(ExceptionEvent), 'kernel.exception')
     (/home/sicrtta/pdr/vendor/symfony/http-kernel/HttpKernel.php:219)
  at Symfony\Component\HttpKernel\HttpKernel->handleThrowable(object(FatalError), object(Request), 1)
     (/home/sicrtta/pdr/vendor/symfony/http-kernel/HttpKernel.php:112)
  at Symfony\Component\HttpKernel\HttpKernel->terminateWithException(object(FatalError), object(Request))
     (/home/sicrtta/pdr/vendor/symfony/http-kernel/EventListener/DebugHandlersListener.php:120)
  at Symfony\Component\HttpKernel\EventListener\DebugHandlersListener::Symfony\Component\HttpKernel\EventListener\{closure}(object(FatalError))
     (/home/sicrtta/pdr/vendor/symfony/error-handler/ErrorHandler.php:588)
  at Symfony\Component\ErrorHandler\ErrorHandler->handleException(object(FatalError))
     (/home/sicrtta/pdr/vendor/symfony/error-handler/ErrorHandler.php:676)
  at Symfony\Component\ErrorHandler\ErrorHandler::handleFatalError()                

Symfony\Component\ErrorHandler\Error\FatalError:
Compile Error: App\Entity\AxeStrategique::__toString(): Return type must be string when declared

  at /home/sicrtta/pdr/src/Entity/AxeStrategique.php:38