An unexpected error happened, and the error template could not be displayed.

Template error not found!
/home/www-data/shaarli/inc/rain.tpl.class.php268
#0 /home/www-data/shaarli/inc/rain.tpl.class.php(164): RainTPL->check_template()
#1 /home/www-data/shaarli/application/render/PageBuilder.php(252): RainTPL->draw()
#2 /home/www-data/shaarli/application/front/controller/visitor/ShaarliVisitorController.php(70): Shaarli\Render\PageBuilder->render()
#3 /home/www-data/shaarli/application/front/controller/visitor/ErrorController.php(45): Shaarli\Front\Controller\Visitor\ShaarliVisitorController->render()
#4 [internal function]: Shaarli\Front\Controller\Visitor\ErrorController->__invoke()
#5 /home/www-data/shaarli/vendor/slim/slim/Slim/App.php(701): call_user_func_array()
#6 /home/www-data/shaarli/vendor/slim/slim/Slim/App.php(394): Slim\App->handleException()
#7 /home/www-data/shaarli/vendor/slim/slim/Slim/App.php(297): Slim\App->process()
#8 /home/www-data/shaarli/index.php(202): Slim\App->run()
#9 {main}