程序报错 Illegal offset type 求大佬们帮忙看看

http://homestead.test/test
Laravel版本：5.7
访问的url ： http://homestead.test/test
报错信息：Illegal offset type
错误目录：/home/vagrant/Code/Laravel/vendor/laravel/framework/src/Illuminate/Auth/AuthManager.php

    public function guard($name = null)
    {
        $name = $name ?: $this->getDefaultDriver();

        return $this->guards[$name] ?? $this->guards[$name] = $this->resolve($name);
    }

web.php

UsersController

view的模板已经存在
求各位大佬求助