Warning (2): Trying to access array offset on value of type null [CORE/cake/libs/folder.php, line 768]

Fatal error: Uncaught Error: Call to a member function init() on null in /home/cuponclu/public_html/core/cake/libs/cache.php:199 Stack trace: #0 /home/cuponclu/public_html/core/cake/libs/cache.php(281): Cache::set(Array) #1 /home/cuponclu/public_html/app/config/bootstrap.php(302): Cache::read('site.default_ci...', 'long') #2 /home/cuponclu/public_html/core/cake/libs/configure.php(659): include('/home/cuponclu/...') #3 /home/cuponclu/public_html/core/cake/libs/configure.php(137): Configure->__loadBootstrap(true) #4 /home/cuponclu/public_html/core/cake/bootstrap.php(49): Configure::getInstance() #5 /home/cuponclu/public_html/app/webroot/index.php(92): include('/home/cuponclu/...') #6 {main} thrown in /home/cuponclu/public_html/core/cake/libs/cache.php on line 199