What is the potential cause of the "MySQL access denied after FLUSH PRIVILEGES" error in phpMyAdmin?

The "MySQL access denied after FLUSH PRIVILEGES" error in phpMyAdmin can occur when the user does not have the necessary privileges to access the MySQL database after privileges have been flushed. To solve this issue, you can try logging in to phpMyAdmin as the root user and manually granting the required privileges to the user.

// Log in to phpMyAdmin as the root user
// Go to the Privileges tab
// Manually grant the necessary privileges to the user