The error is shown below.
And, rendered html, Ummm…just be like the screenshot and you can see discourse-root div is repeated many times.
Really don’t know how to fix this error, please help me.
Thank you very much.

Oh…I meet the problem after restoring with a backup
How did you move to the new domain? Did you use Change the domain name or rename my Discourse? Another way is to backup and restore. Restoring on a new domain name will update the hostname.
Thanks Jay!
I just follow the step Change the domain name or rename my Discourse?.
And I meet the problem after restoring from a backup(old domain).
Is your site http://tartali.online/? That isn’t running a web server. Maybe you see a cached version? Try an incognito window.
Getting the site working is the first step. Then you might try safe-mode.
Thank you!
I solved the problem with safe-mode.
Great! If you’d mark my post (or yours for that matter) as the solution it’ll tidy things up a bit.
Thanks