Autoload error

Module 'Amasty_ShopbyBrand' from '/var/www/vhosts/webdivino.plumadev.com/httpdocs/app/code/Amasty/ShopbyBrand' has been already defined in '/var/www/vhosts/webdivino.plumadev.com/httpdocs/vendor/amasty/module-shop-by-brand'.