Docker error response from daemon: "Conflict ... already in use by container"

I've been using Docker on my PC to run Quantum GIS with the following instructions I've found here: [docker-qgis-desktop - A simple docker container that runs QGIS desktop][1] Everything has been running fine until last week when I started to get this error message: > Error response from daemon: Conflict. > The name "qgis-desktop-2-4" is already in use by container 235566ae17b8. > You have to delete (or rename) that container to be able to reuse that name. I'm not entirely sure what this means despite searching for clues on this site. I hadn't changed anything prior to this happening and have been successfully launching the container with this command: sudo docker run --rm --name="qgis-desktop-2-4" -i -t -v ${HOME}:/home/${USER} -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=unix$DISPLAY kartoza/qgis-desktop:latest How can I fix this? [1]: https://registry.hub.docker.com/u/kartoza/qgis-desktop/