Access denied for user 'root'@'localhost' (using password: YES)

This error message indicates that there was an attempt to log in to a MySQL database using the root username and password, but the login was denied. This could be due to incorrect login credentials or permissions issues. To resolve this issue, ensure that the correct username and password are being used, and that the root user has the necessary permissions to access the database. If necessary, try resetting the root password and/or granting the necessary permissions.