Had the same issue with this python error on my Raspberry.
Found this with Google:
https://github.com/linuxserver/docker-papermerge/issues/4
You need a updated version of libseccomp2, 2.4.3-1 or higher. It is currently not available for Raspberry PI OS, but it is for Ubuntu. You can look into downloading the Deb from Ubuntus repository.
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Thanks! As the docs states, downloading and installing a newer
libseccomp2.debworks for RPi4.
wget http://ftp.us.debian.org/debian/pool/main/libs/libseccomp/libseccomp2_2.5.0-3_armhf.deb
sudo dpkg -i libseccomp2_2.5.0-3_armhf.deb
This version 2.5.0-3 no longer exists, but i found the current version 2.5.1-1 here:
https://packages.debian.org/search?keywords=libseccomp2
Now it works with docker! 
Hope this mixing breaks nothing somewhere else on my Pi.