Notice: ob_end_clean(): failed to delete buffer. No buffer to delete (500 Internal Server Error)

Stack Trace

in src/CaptchaBundle/CaptchaBundle.php at line 50
2. imagepng($img);
3. $str = ob_get_contents();
4. ob_end_clean();
5. $response->setStatusCode(Response::HTTP_OK);
6. $response->setContent($str);
7. return $response;
at ErrorHandler ->handleError ('8', 'ob_end_clean(): failed to delete buffer. No buffer to delete', '/home/abogcima/demo.cimalegalempresarial.com/src/CaptchaBundle/CaptchaBundle.php', '50', array('img' => resource, 'image_text' => 'undefined', 'text_color' => '0', 'text' => array('7', '30', '74', '28', '74', '13', '6', '15'), 'response' => object(Response), 'str' => false))
at ob_end_clean ()
in src/CaptchaBundle/CaptchaBundle.php at line 50
2. imagepng($img);
3. $str = ob_get_contents();
4. ob_end_clean();
5. $response->setStatusCode(Response::HTTP_OK);
6. $response->setContent($str);
7. return $response;
at CaptchaBundle ->getResponseCaptcha ()
in src/FrontBundle/Controller/ContactoController.php at line 93
4. $wat = $captcha->getResponseCaptcha();
6. return $wat;
at ContactoController ->CaptchaAction (object(Request))
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php at line 135
1. $arguments = $this->resolver->getArguments($request, $controller);
3. // call controller
4. $response = \call_user_func_array($controller, $arguments);
6. // view
7. if (!$response instanceof Response) {
at HttpKernel ->handleRaw (object(Request), '1')
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php at line 57
1. $request->headers->set('X-Php-Ob-Level', ob_get_level());
3. try {
4. return $this->handleRaw($request, $type);
5. } catch (\Exception $e) {
6. if ($e instanceof ConflictingHeadersException) {
7. $e = new BadRequestHttpException('The request headers contain conflicting information regarding the origin of this request.', $e);
at HttpKernel ->handle (object(Request), '1', true)
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/DependencyInjection/ContainerAwareHttpKernel.php at line 67
1. $this->container->set('request', $request, 'request');
3. try {
4. $response = parent::handle($request, $type, $catch);
5. } catch (\Exception $e) {
6. $this->container->set('request', null, 'request');
7. $this->container->leaveScope('request');
at ContainerAwareHttpKernel ->handle (object(Request), '1', true)
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php at line 183
1. $this->boot();
2. }
4. return $this->getHttpKernel()->handle($request, $type, $catch);
5. }
7. /**
at Kernel ->handle (object(Request))
in web/app_dev.php at line 32
1. $kernel = new AppKernel('dev', true);
2. $kernel->loadClassCache();
3. $request = Request::createFromGlobals();
4. $response = $kernel->handle($request);
5. $response->send();
6. $kernel->terminate($request, $response);

Logs

1 error

INFO - Matched route "front_captcha".
INFO - Populated the TokenStorage with an anonymous Token.
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\DebugHandlersListener::configure".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\ValidateRequestListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Bundle\FrameworkBundle\EventListener\SessionListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\FragmentListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\RouterListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\LocaleListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\TranslatorListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\Security\Http\Firewall::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Knp\Bundle\PaginatorBundle\Subscriber\SlidingPaginationSubscriber::onKernelRequest".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Bundle\FrameworkBundle\DataCollector\RouterDataCollector::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Component\HttpKernel\DataCollector\RequestDataCollector::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ControllerListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ParamConverterListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\HttpCacheListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\SecurityListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener::onKernelController".
CRITICAL - Uncaught PHP Exception Symfony\Component\Debug\Exception\ContextErrorException: "Notice: ob_end_clean(): failed to delete buffer. No buffer to delete" at /home/abogcima/demo.cimalegalempresarial.com/src/CaptchaBundle/CaptchaBundle.php line 50
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\DebugHandlersListener::configure".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\ValidateRequestListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Bundle\FrameworkBundle\EventListener\SessionListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\FragmentListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\RouterListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\LocaleListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\HttpKernel\EventListener\TranslatorListener::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Symfony\Component\Security\Http\Firewall::onKernelRequest".
DEBUG - Notified event "kernel.request" to listener "Knp\Bundle\PaginatorBundle\Subscriber\SlidingPaginationSubscriber::onKernelRequest".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Bundle\FrameworkBundle\DataCollector\RouterDataCollector::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Symfony\Component\HttpKernel\DataCollector\RequestDataCollector::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ControllerListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\ParamConverterListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\HttpCacheListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\SecurityListener::onKernelController".
DEBUG - Notified event "kernel.controller" to listener "Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener::onKernelController".

Stack Trace (Plain Text)

[1] Symfony\Component\Debug\Exception\ContextErrorException: Notice: ob_end_clean(): failed to delete buffer. No buffer to delete
    at n/a
        in /home/abogcima/demo.cimalegalempresarial.com/src/CaptchaBundle/CaptchaBundle.php line 50

    at Symfony\Component\Debug\ErrorHandler->handleError('8', 'ob_end_clean(): failed to delete buffer. No buffer to delete', '/home/abogcima/demo.cimalegalempresarial.com/src/CaptchaBundle/CaptchaBundle.php', '50', array('img' => resource, 'image_text' => 'undefined', 'text_color' => '0', 'text' => array('7', '30', '74', '28', '74', '13', '6', '15'), 'response' => object(Response), 'str' => false))
        in  line 

    at ob_end_clean()
        in /home/abogcima/demo.cimalegalempresarial.com/src/CaptchaBundle/CaptchaBundle.php line 50

    at CaptchaBundle\CaptchaBundle->getResponseCaptcha()
        in /home/abogcima/demo.cimalegalempresarial.com/src/FrontBundle/Controller/ContactoController.php line 93

    at FrontBundle\Controller\ContactoController->CaptchaAction(object(Request))
        in /home/abogcima/demo.cimalegalempresarial.com/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 135

    at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), '1')
        in /home/abogcima/demo.cimalegalempresarial.com/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 57

    at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), '1', true)
        in /home/abogcima/demo.cimalegalempresarial.com/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/DependencyInjection/ContainerAwareHttpKernel.php line 67

    at Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel->handle(object(Request), '1', true)
        in /home/abogcima/demo.cimalegalempresarial.com/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php line 183

    at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
        in /home/abogcima/demo.cimalegalempresarial.com/web/app_dev.php line 32