¿Cómo gestionar las ausencias en el control horario?

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Fatal error: Uncaught Error: Call to a member function string() on bool in /home/profesto/public_html/apps/cache/volt/_home_profesto_public_html_apps_modules_front_views_content-page-noticia.volt.php:23 Stack trace: #0 [internal function]: unknown() #1 [internal function]: Phalcon\Mvc\View\Engine\Volt->render('/home/profesto/...', Array, true) #2 [internal function]: Phalcon\Mvc\View->_engineRender(Array, 'content-page-no...', true, true, Object(Phalcon\Cache\Backend\File)) #3 [internal function]: Phalcon\Mvc\View->render('index', 'index') #4 /home/profesto/public_html/public/index.php(51): Phalcon\Mvc\Application->handle() #5 {main} thrown in /home/profesto/public_html/apps/cache/volt/_home_profesto_public_html_apps_modules_front_views_content-page-noticia.volt.php on line 23