The specified database user/password combination is rejected: [28000][1045] Access denied for user 'root'@'localhost' (using password: NO)

The error message "The specified database user/password combination is rejected: [28000][1045] Access denied for user 'root'@'localhost' (using password: NO)" indicates that the specified user 'root' with the provided password is being denied access to the database. This can happen if the password is incorrect or if the user does not have the necessary privileges to access the database.

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

1. Double-check the password: Make sure you are using the correct password for the 'root' user. Remember that passwords are case-sensitive, so ensure that you are entering the password exactly as it is.

2. Grant necessary privileges: If the 'root' user does not have the necessary privileges to access the database, you can grant them by logging in to the database with a user that has administrative privileges and running the following command:

   GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION;
   FLUSH PRIVILEGES;

3. Reset the password: If you're still unable to access the database, you can try resetting the password for the 'root' user. This can be done by following these steps:
- Stop the MySQL server.
- Start the MySQL server with the `--skip-grant-tables` option, which allows you to connect to the server without a password.
- Connect to the MySQL server and switch to the 'mysql' database.
- Update the password for the 'root' user using the following command:

     UPDATE user SET authentication_string=PASSWORD('new_password') WHERE User='root';

Replace 'new_password' with the desired password.
- Flush the privileges and restart the MySQL server.

After trying these steps, you should be able to access the database with the 'root' user. If you continue to experience issues, please provide more information about your setup and configuration so that I can assist you further.