[sonata admin] argument "$code" of method
按照这里，在 AppBundle中的Controller建立了 CategoryAdmin 类，当运行html
php bin/console server:start
出现code
Cannot autowire service "AppBundle\Controller\CategoryAdmin": argument "$code" of method "Sonata\AdminBundle\Admin\AbstractAdmin::__construct()" has no type-hint, you should configure its value explicitly.
经过搜索资料，找到 Empty Dashboard Symfony3 sonata adminBundle 最后比对才发现，须要把 src/AppBundle/Controller/CategoryAdmin.php 放入到 src/AppBundle/Admin/CategoryAdmin.php ，
而后再运行 php bin/console server:start 就启动成功了server
最终的效果htm
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