I am trying to build images with guestfish in a Docker container. I am using the [Docker-Toolbox](https://www.docker.com/docker-toolbox) with [Boot2Docker](https://github.com/boot2docker/boot2docker) on Mac. When I try to create a new image with guestfish I get the following error? ``` root@7bc0bf6f6c4f:/test# guestfish -N bootroot:ext2:ext4:1G:64M libguestfs: error: /usr/bin/supermin exited with error status 1. To see full error messages you may need to enable debugging. See http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs ``` Any idea why this happens?