Error: Unable to connect to MySQL server. MySQL server is offline or you dont have access to connect to it or username/password is wrong.

MySQL reported: MySQL server has gone away.

Suggestions:
1) Recheck your MySQL username and password in website's config.php file.
2) Try start MySQL server on your host, maybee there is no connection.
3) Give 'admin' rights to user (root) that you using to connect to MySQL.