Getting openbox error when trying to create new docker

I am trying to create a docker for rmlint. I'm so close but keep getting an error:
 

2020-07-17 00:50:30,527 INFO supervisord started with pid 1
2020-07-17 00:50:30,527 INFO supervisord started with pid 1
2020-07-17 00:50:31,528 INFO spawned: 'easy-novnc' with pid 15
2020-07-17 00:50:31,528 INFO spawned: 'easy-novnc' with pid 15
2020-07-17 00:50:31,529 INFO spawned: 'app' with pid 16
2020-07-17 00:50:31,529 INFO spawned: 'app' with pid 16
2020-07-17 00:50:31,531 INFO spawned: 'openbox' with pid 17
2020-07-17 00:50:31,531 INFO spawned: 'openbox' with pid 17
Listening on http://:8080
Run with --help for more options
2020-07-17 00:50:32,634 INFO success: easy-novnc entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2020-07-17 00:50:32,634 INFO success: easy-novnc entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2020-07-17 00:50:32,634 INFO success: app entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2020-07-17 00:50:32,634 INFO success: app entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2020-07-17 00:50:32,634 INFO success: openbox entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2020-07-17 00:50:32,634 INFO success: openbox entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
Openbox-Message: Failed to open the display from the DISPLAY environment variable.

2020-07-17 00:50:32,895 INFO exited: openbox (exit status 1; not expected)
2020-07-17 00:50:32,895 INFO exited: openbox (exit status 1; not expected)
Unable to init server: Could not connect: Connection refused
2020-07-17 00:50:33,208 INFO spawned: 'openbox' with pid 24
2020-07-17 00:50:33,208 INFO spawned: 'openbox' with pid 24
Openbox-Message: Failed to open the display from the DISPLAY environment variable.

2020-07-17 00:50:33,223 INFO exited: openbox (exit status 1; not expected)
2020-07-17 00:50:33,223 INFO exited: openbox (exit status 1; not expected)
Unable to init server: Could not connect: Connection refused
00:50:33 INFO [__init__.py: 42] root: Starting up.
Unable to init server: Could not connect: Connection refused

(shredder:16): Gtk-WARNING **: 00:50:33.440: cannot open display: :0

2020-07-17 00:50:33,443 INFO exited: app (exit status 1; not expected)
2020-07-17 00:50:33,443 INFO exited: app (exit status 1; not expected)
2020-07-17 00:50:34,444 INFO spawned: 'app' with pid 28
2020-07-17 00:50:34,444 INFO spawned: 'app' with pid 28
2020-07-17 00:50:34,445 INFO spawned: 'openbox' with pid 29
2020-07-17 00:50:34,445 INFO spawned: 'openbox' with pid 29
Openbox-Message: Failed to open the display from the DISPLAY environment variable.

2020-07-17 00:50:34,459 INFO exited: openbox (exit status 1; not expected)
2020-07-17 00:50:34,459 INFO exited: openbox (exit status 1; not expected)
Unable to init server: Could not connect: Connection refused
Unable to init server: Could not connect: Connection refused
00:50:34 INFO [__init__.py: 42] root: Starting up.
Unable to init server: Could not connect: Connection refused

(shredder:28): Gtk-WARNING **: 00:50:34.574: cannot open display: :0

I used these instructions as a template:
https://www.digitalocean.com/community/tutorials/how-to-remotely-access-gui-applications-using-docker-and-caddy-on-ubuntu-18-04#step-2-—-setting-up-the-openbox-menu

My docker file is here:
https://github.com/bobbintb/docker-rmlint

It can also be installed with CA and enabling the docker hub. I started with the tutorial and got Thunderbird working just fine. I just made a few changes to get rmlint to work but that's when I got the error. Maybe I'm missing something but I thought this would be a good place to ask. Once I finish this issue, I should be able to publish it to CA.

Edited July 17, 20205 yr by bobbintb