Fatal error: Array and string offset access syntax with curly braces is no longer supported in /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php on line 215

Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalErrorException: Compile Error: Array and string offset access syntax with curly braces is no longer supported in /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php:215
Stack trace:
#0 {main}

Next Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException: Circular reference detected for service "twig.controller.exception", path: "twig.controller.exception -> twig.controller.exception". in /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Container.php:297
Stack trace:
#0 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ContainerControllerResolver.php(78): Symfony\Component\DependencyInjection\Container->get('twig.controller...')
#1 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerResolver.php(43): Symfony\Component\HttpKernel\Controller\ContainerControllerResolver->createController('twig.controller...')
#2 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php(89): Symfony\Bundle\FrameworkBundle\Controller\ControllerResolver->createController('twig.controller...')
#3 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ContainerControllerResolver.php(41): Symfony\Component\HttpKernel\Controller\ControllerResolver->getController(Object(Symfony\Component\HttpFoundation\Request))
#4 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php(134): Symfony\Component\HttpKernel\Controller\ContainerControllerResolver->getController(Object(Symfony\Component\HttpFoundation\Request))
#5 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 2)
#6 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php(55): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 2, false)
#7 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php(214): Symfony\Component\HttpKernel\EventListener\ExceptionListener->onKernelException(Object(Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent), 'kernel.exceptio...', Object(Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher))
#8 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php(44): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(Array, 'kernel.exceptio...', Object(Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent))
#9 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php(227): Symfony\Component\EventDispatcher\EventDispatcher->dispatch('kernel.exceptio...', Object(Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent))
#10 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php(100): Symfony\Component\HttpKernel\HttpKernel->handleException(Object(Symfony\Component\Debug\Exception\FatalErrorException), Object(Symfony\Component\HttpFoundation\Request), 1)
#11 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php(114): Symfony\Component\HttpKernel\HttpKernel->terminateWithException(Object(Symfony\Component\Debug\Exception\FatalErrorException), Object(Symfony\Component\HttpFoundation\Request))
#12 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/Debug/ErrorHandler.php(602): Symfony\Component\HttpKernel\EventListener\DebugHandlersListener::Symfony\Component\HttpKernel\EventListener\{closure}(Object(Symfony\Component\Debug\Exception\FatalErrorException))
#13 /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/Debug/ErrorHandler.php(693): Symfony\Component\Debug\ErrorHandler->handleException(Object(Symfony\Component\Debug\Exception\FatalErrorException), Array)
#14 [internal function]: Symfony\Component\Debug\ErrorHandler::handleFatalError()
#15 {main}
  thrown in /home/httpd/vhosts/lorenzschaefer.ch/kiplan/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Container.php on line 297