Error: Undefined constant "CACHE_MENU"

#0 /home/kliccoil/domains/gayout.com/app/views/layouts/header.php(5): getMenuData()
#1 /home/kliccoil/domains/gayout.com/app/views/pages/event.php(1): include('/home/kliccoil/...')
#2 /home/kliccoil/domains/gayout.com/app/controllers/EventController.php(218): include('/home/kliccoil/...')
#3 /home/kliccoil/domains/gayout.com/public_html/index.php(515): EventController::show()
#4 {main}