Docker-machine can not find virtualbox driver

I’m using the sentence
docker-machine create --driver vitualbox snort1

and he sends me the following error message
Driver “vitualbox” not found. Do you have the plugin binary “docker-machine-driver-vitualbox” accessible in your PATH?

my version of docker is 2.0.0.3 (31259) for mac
engine 18.09.2
OSMac 10.14.5 Mojave