Apache/2.4.41 (Ubuntu 20.04) Server at [My Domain Name] Port 80

Operating system: Ubuntu
OS version: 20.04

Everything was working fine and suddenly I got this error.

image

What is this error about and how can I solve this?

This error is just irritating me as sometime the domain is opening properly and sometime I am getting this error.

@Joe Can you please help in this?

Any help would be appreciated!

Thank you!