ComposerAutoloaderInit的双重声明导致报错

php7.0

PHP Error : Fatal error: Cannot declare class ComposerAutoloaderInit3017e0ac72a039d5461d41580a86b3d4, because the name is already in use in /var/www/laraver/vendor/composer/autoload_real.php on line 5

求问 导致错误的原因，与什么有关？