Suddently self hosted Rocket Chat goes gray screen


I have self hosted Rocket Chat and working from last one month. today all of sudden the page going to gray screen and i am stuck there. from everywhere the page is a gray screen.

I tried restart and checked no changes.

I tried ‘sudo systemctl start rocketchat’ and the result is ‘Failed to start rocketchat.service: Unit rocketchat.service not found.’

I am in a critical situation. I am almost implemented the rocket chat functionality into my project and now i am stuck.

Please anyone help me.

url showing as : /home and screen showing as

Finally i got a solution for this.
This issue came because i tried to use ifram auth from my site and something went wrong.
So i search too many docs and i got this one

this saved my day.