Slim Application Error

The application could not run because of the following error:

Details

Message: An exception has been thrown during the rendering of a template ("Only variables should be passed by reference") in "title/index.twig" at line 13.
File: /home/protok/protok.nichost.ru/docs/vendor/twig/twig/lib/Twig/Template.php
Line: 269

Trace

#0 /home/protok/protok.nichost.ru/docs/vendor/twig/twig/lib/Twig/Template.php(239): Twig_Template->displayWithErrorHandling(Array, Array)
#1 /home/protok/protok.nichost.ru/docs/vendor/twig/twig/lib/Twig/Environment.php(327) : eval()'d code(26): Twig_Template->display(Array, Array)
#2 /home/protok/protok.nichost.ru/docs/vendor/twig/twig/lib/Twig/Template.php(265): __TwigTemplate_3b0b5b3fd75cb837b1e29aa6755e4466->doDisplay(Array, Array)
#3 /home/protok/protok.nichost.ru/docs/vendor/twig/twig/lib/Twig/Template.php(239): Twig_Template->displayWithErrorHandling(Array, Array)
#4 /home/protok/protok.nichost.ru/docs/vendor/twig/twig/lib/Twig/Template.php(250): Twig_Template->display(Array)
#5 /home/protok/protok.nichost.ru/docs/vendor/slim/extras/Slim/Extras/Views/Twig.php(78): Twig_Template->render(Array)
#6 /home/protok/protok.nichost.ru/docs/vendor/slim/slim/Slim/View.php(195): Slim\Extras\Views\Twig->render('title/index.twi...')
#7 /home/protok/protok.nichost.ru/docs/vendor/slim/slim/Slim/View.php(182): Slim\View->fetch('title/index.twi...')
#8 /home/protok/protok.nichost.ru/docs/vendor/slim/slim/Slim/Slim.php(665): Slim\View->display('title/index.twi...')
#9 /home/protok/protok.nichost.ru/docs/routes/_routes.php(171): Slim\Slim->render('title/index.twi...', Array)
#10 [internal function]: {closure}()
#11 /home/protok/protok.nichost.ru/docs/vendor/slim/slim/Slim/Router.php(200): call_user_func_array(Object(Closure), Array)
#12 /home/protok/protok.nichost.ru/docs/vendor/slim/slim/Slim/Slim.php(1218): Slim\Router->dispatch(Object(Slim\Route))
#13 /home/protok/protok.nichost.ru/docs/vendor/slim/slim/Slim/Middleware/Flash.php(86): Slim\Slim->call()
#14 /home/protok/protok.nichost.ru/docs/vendor/slim/slim/Slim/Middleware/MethodOverride.php(94): Slim\Middleware\Flash->call()
#15 /home/protok/protok.nichost.ru/docs/vendor/slim/slim/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()
#16 /home/protok/protok.nichost.ru/docs/vendor/slim/slim/Slim/Slim.php(1167): Slim\Middleware\PrettyExceptions->call()
#17 /home/protok/protok.nichost.ru/docs/index.php(25): Slim\Slim->run()
#18 {main}