Nginx上的Codeigniter无法加载所有资源

Question

我已经设置了nginx并将codeigniter导入到我的项目中，但无法解决以下错误。我的服务器正在运行Ubuntu 16和php7，但我尝试给予文件权限，但仍然没有解决方案。有人知道问题可能在哪里吗？谢谢

我在nginx中服务器的默认配置文件。

server {
        listen 80 default_server;
        listen [::]:80 default_server;

        # SSL configuration
        #
        # listen 443 ssl default_server;
        # listen [::]:443 ssl default_server;
        #
        # Note: You should disable gzip for SSL traffic.
        # See: https://bugs.debian.org/773332
        #
        # Read up on ssl_ciphers to ensure a secure configuration.
        # See: https://bugs.debian.org/765782
        #
        # Self signed certs generated by the ssl-cert package
        # Don't use them in a production server!
        #
        # include snippets/snakeoil.conf;

        root /var/www/observum/site;

        # Add index.php to the list if you are using PHP
        index index.php index.html index.htm;

        server_name 45.79.4.55;

        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                try_files $uri $uri/ /index.php?$query_string;
        }

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        location ~ \.php$ {
                include snippets/fastcgi-php.conf;
        #
        #       # With php7.0-cgi alone:
        #       fastcgi_pass 127.0.0.1:9000;
        #       # With php7.0-fpm:
                fastcgi_pass unix:/run/php/php7.0-fpm.sock;
        }




    # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        location ~ /\.ht {
                deny all;
        }
}


# Virtual Host configuration for example.com
#

Screenshot