在stderr中发送的Nginx错误10840 FastCGI：“PHP消息：PHP致命错误：从上游读取响应头时，客户端：

I am trying to setup nginxe and PHP on my VPS. I have nginxe installed, but now I have an error that is preventing PHP from working.

The error is:

*10840 FastCGI sent in stderr: "PHP message: PHP Fatal error: Call to undefined method IPS\Request::confirmedDelete() in /var/www/html/applications/feedback/modules/front/feedback/listing.php on line 116" while reading response header from upstream, client: 162.158.92.186, server: _, request: "GET

What causes this error, and how do I fix?

Here is my configuration:

server {
listen 80 default_server;
listen [::]:80 default_server;
listen       443 default ssl;

root /var/www/html;
index index.php index.html index.htm index.nginx-debian.html;

server_name *********:443 ;

location / {
    try_files $uri $uri/ =404;
}

location ~ \.php$ {
    include snippets/fastcgi-php.conf;
    fastcgi_pass unix:/var/run/php5-fpm.sock;
}

location ~ /\.ht {
    deny all;
}

fastcgi_buffers 16 16k; 
fastcgi_buffer_size 32k;
fastcgi_param HTTPS $https;


error_page 404 /404s.html;
location = /404s.html {
root /usr/share/nginx/html;
     internal;
}