laraveladmin 安装后输入 url 报 404

依次操作如下命令后：
composer create-project –prefer-dist laravel/laravel laravel-admin 5.5.*
composer require encore/laravel-admin
php artisan vendor:publish –provider=”Encore\Admin\AdminServiceProvider”
php artisan admin:install
在浏览器地址栏输入路由后报如下错误：

nginx配置如下：

server {
        listen       8088;
        server_name  merchant.com.cn;
        root         /data0/tmp/merchant/public;
        index index.php index.html index.htm;
        client_max_body_size 8M;
        client_body_buffer_size 128k;
        fastcgi_intercept_errors on;
        location / {
            try_files $uri $uri/ /index.php?$query_string;
        }

        location ~ \.php$ {
            fastcgi_pass 127.0.0.1:9000;
            fastcgi_index index.php;
            fastcgi_split_path_info ^(.+\.php)(/.+)$;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            include fastcgi_params;
        }
        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }

请各位帮忙看看可能是什么原因呢？是还需要在代码中修改什么地方么？望指教！