I have finished all the tutorials, but v2ray still doesn't work.

[Jiang Wenqi]

The log shows

[Warning] failed to handler mux client connection > v2ray.com/core/proxy/vmess/outbound: failed to find an available destination > v2ray.com/core/common/retry: [v2ray.com/core/transport/internet/websocket: failed to dial WebSocket > v2ray.com/core/transport/internet/websocket: failed to dial to (wss://vincifuckgfw.cf/ws): > dial tcp: lookup vincifuckgfw.cf on 223.5.5.5:53: no such host] > v2ray.com/core/common/retry: all retry attempts failed

Please help me figure out this problem, thanks!