502 Bad Gateway error after installing helpdesk


I have installed helpdesk with erpnext, using the documentation GitHub - frappe/helpdesk: Modern, Streamlined, Free and Open Source Customer Service Software, after the same the website is not loading, but erpnext working with no issues though. May I know if need to do anything else ?

I have tried the below steps but no use

bench --site [sitename] clear-cache
bench --site [sitename] clear-website-cache
bench --site [sitename] migrate

bench update --patch
bench build

Can anyone advice?

Thank you in advance