pagespeed errors on start, this is default.conf file I am using

default.conf

server {
    ## Your website name goes here.
    server_name mysite.com www.mysite.com;
    ## Your only path reference.
    root /var/www/;
    listen 8080;
    ## This should be in your http block and if it is, it's not needed here.
    index index.php index.html index.htm ;

    include conf.d/drop;

        location / {
                # This is cool because no php is touched for static content
                        try_files $uri $uri/ /index.php?q=$uri&$args;
        }

        location ~ \.php$ {
            fastcgi_buffers 8 256k;
            fastcgi_buffer_size 128k;
            fastcgi_intercept_errors on;
            include fastcgi_params;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            fastcgi_pass unix:/dev/shm/php-fpm-www.sock;


        }

pagespeed on;

# Needs to exist and be writable by nginx.
pagespeed FileCachePath /var/ngx_pagespeed_cache;

# Ensure requests for pagespeed optimized resources go to the pagespeed handler
# and no extraneous headers get set.
location ~ "\.pagespeed\.([a-z]\.)?[a-z]{2}\.[^.]{10}\.[^.]+" {
  add_header "" "";
}
location ~ "^/ngx_pagespeed_static/" { }
location ~ "^/ngx_pagespeed_beacon$" { }
location /ngx_pagespeed_statistics { allow 127.0.0.1; deny all; }
location /ngx_pagespeed_message { allow 127.0.0.1; deny all; }
}