There is some problem in connection

:SQLSTATE[HY000] [1045] Access denied for user 'u224034679_islsoliman'@'localhost' (using password: YES)
Fatal error: Uncaught Error: Call to a member function prepare() on null in /home/u704547322/domains/italkedtech.com/public_html/Software/Project Websites/ecommerce/includes/header.php:13 Stack trace: #0 /home/u704547322/domains/italkedtech.com/public_html/Software/Project Websites/ecommerce/index.php(8): include() #1 {main} thrown in /home/u704547322/domains/italkedtech.com/public_html/Software/Project Websites/ecommerce/includes/header.php on line 13