Error "NGINX configuration check failed." using EasyEngine v3.7.5

I have started getting this message today and have no idea what happened!

Can anyone please help here?

Output for nginx -t is

nginx: [emerg] unknown directive "pstream" in /etc/nginx/conf.d/upstream.conf:14

nginx: configuration file /etc/nginx/nginx.conf test failed

Thanks in advanceā€¦

Resolved the issue by modifying /etc/nginx/conf.d/upstream.conf and adding u in start of pstream to make a complete word upstream

Not sure how it got changed in first place.