Running IDP main in a container

Demo code works but not sure why there is a local close error (see last message below):

[1545626 ms] Start: Run in container: cat /proc/680/environ
[1660371 ms] Port forwarding connection from 62031 > 35281 > 35281 in the container.
[1660371 ms] Start: Run in container: /root/.vscode-server/bin/eaa41d57266683296de7d118f574d0c2652e1fc4/node -e
[1662346 ms] Port forwarding 62031 > 35281 > 35281 stderr: Connection established
[1667353 ms] Port forwarding 62031 > 35281 > 35281 stderr: Remote close
[1667396 ms] Port forwarding 62031 > 35281 > 35281 terminated with code 0 and signal null.
[1787404 ms] Port forwarding 62031 > 35281 > 35281: Local close with error

Despite the error message the IDP code seems to work. Not sure what is causing the message.