Error in the docker installation

[ghost]

Hello,
during the OIOIOI installation using the docker, in the command:

docker build -t oioioi .

during step 32 I received an error:

Step 32/32 : RUN ./manage.py download_sandboxes -q -y -c /sio2/sandboxes
---> Running in 229620a57ae6
Traceback (most recent call last):
File "./manage.py", line 14, in
execute_from_command_line(sys.argv)
File "/home/oioioi/.local/lib/python2.7/site-packages/django/core/management/init.py", line 353, in execute_from_command_line
utility.execute()
File "/home/oioioi/.local/lib/python2.7/site-packages/django/core/management/init.py", line 327, in execute
django.setup()
File "/home/oioioi/.local/lib/python2.7/site-packages/django/init.py", line 18, in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/oioioi/.local/lib/python2.7/site-packages/django/apps/registry.py", line 89, in populate
"duplicates: %s" % app_config.label)
django.core.exceptions.ImproperlyConfigured: Application labels aren't unique, duplicates: workers
The command '/bin/sh -c ./manage.py download_sandboxes -q -y -c /sio2/sandboxes' returned a non-zero code: 1

What to do?
Regards.
Sorry for my English.

[cytadela8]

This issue no longer happens. Docker installation should work now.