Since I just updated Docker to 1.1.0 I get:
Error response from daemon: client and server don\'t have same version (client : 1.13, server: 1.12) <
Error response from daemon: client and server don\'t have same version (client : 1.13, server: 1.12)
The only thing the worked for me was removing the boot2docker image from VirtualBox then completely deleting ~/.boot2docker folder, and finally running boot2docker init again.
~/.boot2docker
boot2docker init