I encountered this error in Mysql version 5.7.13 after upgrading Laragon when attempting to connect with HeidiSQL.<br>Here's how to fix it (from the command line):<br><code>mysql -u {user} -p<br>mysql> set @@global.show_compatibility_56=ON;<br></code><br><em>Replace {user} with your actual username (probably root). When it prompts for password.. enter your password.</em><br>This is a temporary fix that would need to be run once on server start.<br>If it fixes your issue, add this to your my.ini:<br><code>[mysqld]<br>show_compatibility_56 = 1</code><br><em>You should already have options under [mysqld] .. append this new one to that section or modify existing entry accordingly.</em>