Seems like something is corrupted in docker.
Can you try the following
docker prune again
2. systemctl restart docker
3 If nothing works, nuke the
/var/lib/docker directory, and redo
docker pull trisulnsm/trisul6. Fortunately the data will not be lost as Trisul stores all its data and config in the volume. However you will have to pull the full base image again. A few gigabytes
You may need to clean up docker and re-pull the image.