Connection failed: SQLSTATE[HY000] [1045] Access denied for user 'root'@'172.20.0.3' (using password: YES)<br />
<b>Fatal error</b>:  Uncaught TypeError: Argument 1 passed to track_user_session() must be an instance of PDO, null given, called in /var/www/html/config/db.php on line 60 and defined in /var/www/html/config/db.php:47
Stack trace:
#0 /var/www/html/config/db.php(60): track_user_session(NULL)
#1 /var/www/html/index.php(3): include('/var/www/html/c...')
#2 {main}
  thrown in <b>/var/www/html/config/db.php</b> on line <b>47</b><br />