Autoload error

Module 'MaxServ_YoastSeo' from '/home/deb64663n4/domains/xaptovi.com/public_html/app/code/MaxServ/YoastSeo' has been already defined in '/home/deb64663n4/domains/xaptovi.com/public_html/vendor/maxserv/magento-module-yoastseo'.