Autoload error

Module 'Zymion_SeoFriendlyImages' from '/var/hpwsites/u_ruiten/website/html/webroot/app/code/Zymion/SeoFriendlyImages' has been already defined in '/var/hpwsites/u_ruiten/website/html/webroot/vendor/zymion/module-seo-friendly-images'.