nginx config error: "[emerg] unexpected end of file, expecting ";" or "}" - nginx

Question

I have below nginx config which is running into this error while trying to start the nginx:
user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
events {
worker_connections 768;
# multi_accept on;
}
http {
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;
server_names_hash_bucket_size 164;
# server_name_in_redirect off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# SSL Settings
##
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript
text/xml application/xml application/xml+rss text/javascript;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
upstream qe {
server qe.domain.com:443;
}
upstream staging {
server staging.domain.com:443;
}
upstream beta {
server mydomain.com:443;
server mydomain-beta.com:443;
}
# map to different upstream backends based on header
map $http_x_server_select $pool {
default "staging";
qe "qe";
beta "beta";
}
server {
listen 80;
server_name 100.0.0.0 ec2.instance.compute-1.amazonaws.com;
location / {
proxy_pass https://$pool;
#standard proxy settings
proxy_set_header X-Real-IP $remote_addr;
proxy_redirect off;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-NginX-Proxy true;
proxy_connect_timeout 600;
proxy_send_timeout 600;
proxy_read_timeout 600;
send_timeout 600;
}
}
}
#mail {
# # See sample authentication script at:
# # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
# # auth_http localhost/auth.php;
# # pop3_capabilities "TOP" "USER";
# # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
# server {
# listen localhost:110;
# protocol pop3;
# proxy on;
# }
#
everything seems in place but still seeing this error. Am I missing something? I t is definitely not the curly braces causing it as I have the braces in place. But not sure what is causing this error.
It gives the error on the last line of the config file where I have some commented config which came by default when I installed nginx. But don't think it is the reason as I tried removing that also.
Update: So I removed everything from my config file and still getting the same error. I am confused what is going on now.