Fatal error: Uncaught TypeError: Return value of Iko\Core::PDO() must be an instance of PDO, null returned in C:\xampp\htdocs\Ikobb\core\core.php:522Stack trace:#0 C:\xampp\htdocs\Ikobb\core\lib\multiton\cache.php(87): Iko\Core::PDO()#1 C:\xampp\htdocs\Ikobb\core\module.php(119): Iko\Lib\Multiton\Cache::searches(Array)#2 C:\xampp\htdocs\Ikobb\core\module.php(499): Iko\Module::loadByNamespace('Iko\\CMS')#3 [internal function]: Iko\myAutoloader('Iko\\CMS')#4 C:\xampp\htdocs\Ikobb\index.php(17): spl_autoload_call('Iko\\CMS')#5 {main} thrown in C:\xampp\htdocs\Ikobb\core\core.php on line 522