ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost:3306' (10061)

This error message indicates that there is a problem connecting to the MySQL server on the local machine at the default port of 3306. There are several possible causes for this error, including:

- The MySQL server is not running: Check to see if the MySQL server is running by checking the services or processes on your system.
- The MySQL server is not configured to listen on localhost:3306: Check the configuration file for MySQL (usually my.cnf or my.ini) to ensure that the server is configured to listen on the correct IP address and port.
- Firewall or antivirus software is blocking the connection: Check your firewall or antivirus software to ensure that it is not blocking the connection to the MySQL server.
- Incorrect login credentials: Double-check that you are using the correct username and password to connect to the MySQL server.

To troubleshoot this error, you may need to consult the MySQL documentation or seek assistance from a MySQL expert.