Webview Error with Custom Domain

After attempting connect a custom domain, 48 hours passed and nothing happened but this weird error. I don’t know what to do about but it says this:

It looks like febe699d-471c-4bcf-afb3-4c019d90b0f7.id.repl.co closed the connection
or on google chrome
febe699d-471c-4bcf-afb3-4c019d90b0f7.id.repl.co unexpectedly closed the connection

What should I do?