artisan migration error "Class 'Doctrine\\DBAL\\Driver\\PDOMySql\\Driver' not found"

This error message is indicating that the PHP extension for PDO MySQL is not installed or not enabled on your system. This extension is required for Doctrine to be able to connect to a MySQL database using the PDO driver. To resolve this issue, you can try installing the extension by running the following command:

sudo apt-get install php-mysql

or

sudo yum install php-mysql

You may also need to enable the extension in your php.ini file by adding the following line:

extension=pdo_mysql.so

After making these changes, you will need to restart your web server for the changes to take effect.

If you are using Windows, you may need to download the PDO MySQL driver from the official PHP website and add it to your php.ini file.

You should also check your composer.json file for the doctrine/dbal package version and make sure that it's compatible with your version of PHP.