Docker machine "default" does not exist. Use "docker-machine ls" to list machines. Use "docker-machine create" to add a new one.

Problem:

Docker machine "default" does not exist. Use "docker-machine ls" to list machines. Use "docker-machine create" to add a new one.

Solution:
docker-machine create default

ref:
https://stackoverflow.com/questions/39966083/docker-machine-no-machine-name-no-default-exists