Nginx – access forbidden by rule on nginx

I am consistently getting following errors in error.log

2016/02/15 11:54:21 [error] 25085#0: *42344 access forbidden by rule, client: 122.252.249.67, server: example.com, request: "GET /wp-content/uploads/sp-resources/forum-themes/reboot/styles/reboot.php?overlay=chrome&theme=reboot&device=desktop&site=1&ver=4.4.2 HTTP/1.1", host: "example.com", referrer: "http://example.com/index.php/forum/"

I am unable to locate, which rule is denying the access.
/etc/nginx/common/locations.conf

# NGINX CONFIGURATION FOR COMMON LOCATION
# DO NOT MODIFY, ALL CHANGES LOST AFTER UPDATE EasyEngine (ee)
# Basic locations files
location = /favicon.ico {
  access_log off;
  log_not_found off;
  expires max;
}
location = /robots.txt {
  # Some WordPress plugin gererate robots.txt file
  # Refer #340 issue
  try_files $uri $uri/ /index.php?$args;
  access_log off;
  log_not_found off;
}
# Cache static files
location ~* \.(ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|css|rss|atom|js|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf|swf)$ {
  add_header "Access-Control-Allow-Origin" "*";
  access_log off;
  log_not_found off;
  expires max;
}
# Security settings for better privacy
# Deny hidden files
location ~ /\.well-known {
  allow all;
}
location ~ /\. {
  deny all;
  access_log off;
 log_not_found off;
}
# Deny backup extensions & log files
location ~* ^.+\.(bak|log|old|orig|original|php#|php~|php_bak|save|swo|swp|sql)$ {
  deny all;
  access_log off;
  log_not_found off;
}
# Return 403 forbidden for readme.(txt|html) or license.(txt|html) or example.(txt|html)
if ($uri ~* "^.+(readme|license|example)\.(txt|html)$") {
  return 403;
}
# Status pages
location /nginx_status {
  stub_status on;
  access_log off;
  include common/acl.conf;
}
location ~ ^/(status|ping) {
  include fastcgi_params;
  fastcgi_pass php;
  include common/acl.conf;
}
# EasyEngine (ee) utilities
# phpMyAdmin settings
location /pma {
  return 301 https://$host:22222/db/pma;
}
location /phpMyAdmin {
  return 301 https://$host:22222/db/pma;
}
location /phpmyadmin {
  return 301 https://$host:22222/db/pma;
}
location /phpmyadmin {
  return 301 https://$host:22222/db/pma;
}
# Adminer settings
location /adminer {
  return 301 https://$host:22222/db/adminer;
}

/etc/nginx/sites-available/example.com

server {

    # Uncomment the following line for domain mapping
    # listen 80 default_server;

    server_name example.com   *.example.com;

    # Uncomment the following line for domain mapping
    #server_name_in_redirect off;

    access_log /var/log/nginx/example.com.access.log rt_cache;
    error_log /var/log/nginx/example.com.in.error.log;


    root /var/www/example.com/htdocs;



    index index.php index.html index.htm;


    include common/wpfc.conf;
    include common/wpsubdir.conf;
    include common/wpcommon.conf;
    include common/locations.conf;
    include /var/www/example.com/conf/nginx/*.conf;
}

/etc/nginx/sites-enabled/example.com

server {

    # Uncomment the following line for domain mapping
    # listen 80 default_server;

    server_name example.com   *.example.com;

    # Uncomment the following line for domain mapping
    #server_name_in_redirect off;

    access_log /var/log/nginx/example.com.access.log rt_cache;
    error_log /var/log/nginx/example.com.error.log;


    root /var/www/example.com/htdocs;



    index index.php index.html index.htm;


    include common/wpfc.conf;
    include common/wpsubdir.conf;
    include common/wpcommon.conf;
    include common/locations.conf;
    include /var/www/example.com/conf/nginx/*.conf;
}

Additional information: I am using SimplePress on WordPress. I have installed WordPress using easyengine.