ERROR 1698 (28000): Access denied for user 'root'@'localhost'

This error occurs when the root user is trying to access the MySQL server, but does not have the necessary privileges to do so.

To resolve this issue, you can try the following steps:

1. Log in to MySQL with an existing user account that has administrative privileges.

2. Run the following command to grant the root user full privileges:

GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'your_password' WITH GRANT OPTION;

Note: Replace 'your_password' with a strong password of your choice.

3. Flush the privileges to apply the changes:

FLUSH PRIVILEGES;

4. Exit MySQL and try logging in again with the root user and the new password.

If the above steps do not work, it is possible that the root user has been disabled or the password has been changed. In that case, you may need to reset the root user's password or contact the MySQL administrator for assistance.