Fatal error: Uncaught mysqli_sql_exception: No such file or directory in /opt/flex-php/my/classes/connection.php:3
Stack trace:
#0 /opt/flex-php/my/classes/connection.php(3): mysqli_connect('localhost', 'runtrainer_admi...', 'Mi7vG7Zn', 'runtrainer_db')
#1 /opt/flex-php/login.php(36): include('/opt/flex-php/m...')
#2 {main}
thrown in /opt/flex-php/my/classes/connection.php on line 3