docker version prints:
Client version: 1.0.1
Client API version: 1.12
Go version (client): go1.2.1
Git commit (client): 990021a
Server version:
I had the same problem on my Mac - some months ago I installed docker, boot2docker und docker-compose (formerly fig) via brew. After I played a while with docker, I left it for some reason as it was. Now new docker-toolbox and docker-machine come into play and I "just" wanted to use a preconfigured docker-file and say "up". I got the error above.
I tried all things i found on the net - also the downgrade-option (which didn't feel right for me). The thing finally worked, was just to install new docker-toolbox via homebrew cask and upgrade my docker-vm with the following commands:
docker-machine upgrade docker-dev
Where "docker-dev" is your docker-vm-Name in Virtualbox (start it, to see the correct name).
Now docker runs fine again and the docker version command brings a normal-setup`s output.