Ubuntu installation issues

[ghost]

sudo docker run -it --privileged --mount type=bind,source=$HOME/.sentinel,target=/root/.sentinel -p 3000:3000 -p 1194:1194/udp sentinelofficial/stt1-dvpn-openvpn
I[12-26|23:43:06.502] Starting RPC HTTP server on tcp://localhost:1317 module=rest-server
I[12-26|23:43:06.702] REST server started module=rest-server

Please enter account name: **********
Please enter account password: **********

Updating location and Internet speed information...
2020/12/26 23:45:13 http: multiple response.WriteHeader calls
I[12-26|23:45:13.687] Served RPC HTTP response module=rest-server method=POST url=/register/vpn status=401 duration=26 remoteAddr=127.0.0.1:46396
No JSON object could be decoded

"No JSON object could be decoded".
Can't find any infos on this bug. Suggestions?

[mysticsage1]

I am having the same issue.

[macsign]

Same for me