It says It has something to do with this line at the first line
$connection->prepare("set session sql_mode=''")->execute();
I removed the line and it fixed it, but I cannot do anything, help!!!

    What's your system config ? Did Flarum run before or it broken after install ? Do you have extensions installed ?

    One of my guess (but it's hard to tell without the details above) would be that php-mysql module is not enabled.

      17 days later

      inparsian what contain of your .htaccess? because i get same problem after upload my flarum that manage in localhost then upload to hosting. I have already to configure database and base url but problem still exist

          bundet what are your DB settings? Leave out the password. Most likely the cause is there.

              luceos I can not leave the password field because the hosting service requires it to be filled.
              and this effect if I leave the password

                  inparsian if I do a same thing, like this

                  // If the "strict" option has been configured for the connection we will setup
        // strict mode for this session. Strict mode enforces some extra rules when
        // using the MySQL database system and is a quicker way to enforce them.
        if (isset($config['strict'])) {
            if ($config['strict']) {
                $connection->prepare("set session sql_mode='STRICT_ALL_TABLES'")->execute();
            } else {
                //$connection->prepare("set session sql_mode=''")->execute();
            }
        }

                  and i get this error

                    Haloooo every body here, hahahahah Yeeaahhh Problem solved, ?

                    I am very happy after several hours trying to solve my own problem, it is very simple, just delete the parameters in config.php

                    I will make a short tutorial in this forum with the post title "How to Upload Flarum to Shared Hosting After Managed in Localhost"

                    <?php return array (
  'debug' => true,
  'database' => 
  array (
    'driver' => 'mysql',
    'host' => 'localhost',
    'database' => 'yourdb_inhost',
    'username' => 'yourun_inhost',
    'password' => 'yourpwd_inhost',
    'charset' => 'utf8mb4',
    'collation' => 'utf8mb4_unicode_ci',
    'prefix' => '',
    'strict' => false, //<---JUST REMOVE THIS PARAMETER
  ),
  'url' => 'https://fgate.000webhostapp.com/',
  'paths' => 
  array (
    'api' => 'api',
    'admin' => 'admin',
  ),
);

                    see the demo https://fgate.000webhostapp.com/
                    I've verified this tip by performed it to different host, see the demo http://forum.gatewan.com

                    bundet I meant leave the password out when posting them here. Great work on solving this by yourself!