Can't connect to MySQL server on 'localhost' (10061)

This error message usually indicates that there is a problem with the connection between your application and the MySQL server running on the same machine (localhost).

Here are some common causes and solutions:

1. MySQL server is not running: Check if the MySQL server is running on your computer. You can do this by opening the MySQL Command Line Client and typing "status" or by checking the Services application in Windows.

2. MySQL port is blocked or not listening: By default, MySQL listens on port 3306. If this port is blocked by a firewall or not listening, you won't be able to connect to the server. Make sure that the port is not blocked by the firewall and that MySQL is listening on the correct port.

3. Incorrect login credentials: Check that the username and password you are using to connect to the MySQL server are correct. By default, the root user has no password.

4. Incorrect host name: Make sure that you are using the correct host name for the MySQL server. If you are connecting to the MySQL server on the same machine, use "localhost" or "127.0.0.1".

5. MySQL configuration issues: Check the MySQL configuration file (my.cnf) to make sure that the server is configured correctly. If you are not sure how to do this, consult the MySQL documentation or seek help from a qualified MySQL administrator.