Connection failed: SQLSTATE[HY000] [1698] Access denied for user 'root'@'localhost'

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Fatal error: Uncaught Error: Call to a member function prepare() on null in /home/kitfos23/public_html/webbserverprogrammering/projekt/snake_oil_seller/php/selectposts.php:16 Stack trace: #0 {main} thrown in /home/kitfos23/public_html/webbserverprogrammering/projekt/snake_oil_seller/php/selectposts.php on line 16