Changed the index file, the current page error reads:

Whoops, looks like something went wrong.

1/1 Twig_Error_Loader in Chain.php line 115:
Template "admin/setup_requirements_fail.html.twig" is not defined.
in Chain.php line 115
at Twig_Loader_Chain->getCacheKey('admin/setup_requirements_fail.html.twig') in Environment.php line 312
at Twig_Environment->getTemplateClass('admin/setup_requirements_fail.html.twig', null) in Environment.php line 378
at Twig_Environment->loadTemplate('admin/setup_requirements_fail.html.twig') in Environment.php line 347
at Twig_Environment->render('admin/setup_requirements_fail.html.twig', array('checker' => object(RequirementsChecker))) in TwigTemplatingEngine.php line 29
at TwigTemplatingEngine->renderView('admin/setup_requirements_fail.html.twig', array('checker' => object(RequirementsChecker))) in TwigTemplatingEngine.php line 22
at TwigTemplatingEngine->render('admin/setup_requirements_fail.html.twig', array('checker' => object(RequirementsChecker))) in SetupController.php line 73
at SetupController->setupAction()
at call_user_func_array(array(object(SetupController), 'setupAction'), array()) in HttpKernel.php line 139
at HttpKernel->handleRaw(object(Request), '1') in HttpKernel.php line 62
at HttpKernel->handle(object(Request), '1', true) in Application.php line 586
at Application->handle(object(Request)) in Application.php line 563
at Application->run() in index.php line 7