Fatal error: Uncaught Error: Call to a member function execute() on bool in /opt/lampp/htdocs/Blog/app/database/db.php:33 Stack trace: #0 /opt/lampp/htdocs/Blog/app/controllers/topics.php(14): selectAll('topics') #1 /opt/lampp/htdocs/Blog/index.php(3): include('/opt/lampp/htdo...') #2 {main} thrown in /opt/lampp/htdocs/Blog/app/database/db.php on line 33