No such host Err when start tunnels

[html5syt]

When I start my tunnels ,I received these err:

ERR Error opening metrics server listener error=“lookup localhost on 8.8.8.8:53: no such host”
Error opening metrics server listener: lookup localhost on 8.8.8.8:53: no such host

I don’t know how to solve this problem,who can help me?
(first,i use CLI to create my tunnel.second,i’m in China.)

[html5syt]

i tried changing DNS to 1.1.1.1,but it didn’t work too.
is the domain or server of tunnel down?

[html5syt]

oops,i forget to write this information:i using cloudflared in Ubuntu base on termux proot container.

[html5syt]

i ping my domain of cf tunnel,and it’ tells me unknown host(=don’t have this name).

and i tried rollback the version,but it’s don’t ,too.

[html5syt]

domain is outdated?!!