docker: Error response from daemon: invalid bit range [4, 4]

Fooling around with docker, trying to create a overlay network. Copied some settings from net, and when starting container, docker reported an error.

root@infra-front:~# docker network create -d overlay --subnet=192.168.50.0/24 --gateway=192.168.50.1 --ip-range=192.168.50.4/32 test

32bdd738a6b7444d8c9a471e451793acd8793db1739f4f660b9981df018252c1

root@infra-front:~# docker run --rm -ti --net test alpine sh

docker: Error response from daemon: invalid bit range [4, 4].

It seems that my network settings where wrong. For now, I just removed gateway and subnet and things started to work.