What is a Database Error Occurred and How to Fix It?

[foz]

An error occurred with the database: Error Number 2006 - MySQL server has gone away. The query attempted was: SELECT * FROM `tbl_instagram_account` ORDER BY `id` ASC LIMIT 99, 5000. The issue is in the file third_party/MX/Controller.php, at line number 78.
Friends, I am receiving an error in a specific PHP script, login.php. The page loads for minutes and then I get this error, meaning the login page is not opening. In short, I am seeking assistance from friends who are familiar with this issue.