docker: Error response from daemon: invalid volume spec ":": invalid volume specification: ':'.

[khalilfrikel]

Hi
While trying install inspectit on docker linux I had this issue:
atk@node1:~$ docker run -it --rm --name inspectIT-GUI -e DISPLAY -e XAUTHORITY --net=host -v ${XAUTHORITY}:${XAUTHORITY} inspectit/inspectit
docker: Error response from daemon: invalid volume spec ":": invalid volume specification: ':'.
could anyone help, thanks a lot