What can I do???

How long ago did you set up the domain? I get an address not found error, which means the name server I use does not recognize the address.

Contact your host provider to make sure everything is set up correctly for your site.

As it’s a ‘.com.np’ domain, I did a search for it (bnepal.com.np) at https://www.mos.com.np which gives “The domain name bnepal.com.np is not yet registered”.