cannot import name in Debian 10.3

[rollopack]

After the upgrade at Debian 10.3 I get the following errors in create/views.py

cannot import name INSTANCE_VOLUME_DEFAULT_IO
cannot import name INSTANCE_VOLUME_DEFAULT_DETECT_ZEROES
cannot import name INSTANCE_VOLUME_DEFAULT_DISCARD

1.11.26
ImportError
cannot import name INSTANCE_VOLUME_DEFAULT_IO
/srv/webvirtcloud/create/views.py in <module>, line 19
/srv/webvirtcloud/venv/bin/python2
2.7.16
['/srv/webvirtcloud',  '/srv/webvirtcloud/venv/bin',  '/srv/webvirtcloud/venv/lib/python2.7',  '/srv/webvirtcloud/venv/lib/python2.7/plat-x86_64-linux-gnu',  '/srv/webvirtcloud/venv/lib/python2.7/lib-tk',  '/srv/webvirtcloud/venv/lib/python2.7/lib-old',  '/srv/webvirtcloud/venv/lib/python2.7/lib-dynload',  '/usr/lib/python2.7',  '/usr/lib/python2.7/plat-x86_64-linux-gnu',  '/usr/lib/python2.7/lib-tk',  '/srv/webvirtcloud/venv/local/lib/python2.7/site-packages',  '/srv/webvirtcloud/venv/lib/python2.7/site-packages']

[rollopack]

Sorry, my mistake.
The settings.py file was missing the INSTANCE_VOLUME_DEFAULT_IO, INSTANCE_VOLUME_DEFAULT_DETECT_ZEROES and INSTANCE_VOLUME_DEFAULT_DISCARD entries.