docker-machine create error … VBoxManage: error: Unknown option: --synthcpu

Question

I am trying to create docker-machine using virtualbox as the driver.

➜  ~  docker-machine create --driver virtualbox default

However, I am getting following error

INFO[0000] Creating SSH key...
INFO[0000] Creating VirtualBox VM...
ERRO[0005] Error creating machine: exit status 1
WARN[0005] You will want to check the provider to make sure the machine and associated resources were properly removed.
FATA[0005] Error creating machine

I ran it with --debug option and here is the detailed log

I see the following error at the end of the log --

VBoxManage: error: Unknown option: --synthcpu

Answer 1

I uninstalled docker toolbox and reinstalled it using this shell script -- https://github.com/docker/toolbox/blob/master/osx/uninstall.sh

Fixed the problem.