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I encountered this error in Mysql version 5.7.13 after upgrading Laragon when attempting to connect with HeidiSQL.
Here's how to fix it (from the command line):
mysql -u {user} -p
mysql> set @@global.show_compatibility_56=ON;

Replace {user} with your actual username (probably root). When it prompts for password.. enter your password.
This is a temporary fix that would need to be run once on server start.
If it fixes your issue, add this to your my.ini:
[mysqld]
show_compatibility_56 = 1

You should already have options under [mysqld] .. append this new one to that section or modify existing entry accordingly.

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