Error after registration usnig laravel ui

after i click register button i get the error bellow
Swift_TransportException Process could not be started [The system cannot find the path specified. ]
and whene i go to phpmyadmin it seems that i have the new user record in my database
i don’t know what’s the relation between the auth and swiftMailer
i already tried clearing the config using php artisan config:clear changing MAIL_DRIVER, MAIL_HOST, MAIL_PORT i don’t know what to do