I received the follow error:
ERROR: Unfortunately, there’s an incompatibility between HAXM
hypervisor and VirtualBox 4.3.30+ which doesn’t allow multiple
hypervisors to co-exist. It is being actively worked on; you can find
out more about the issue at http://b.android.com/197915 (Android) and
https://www.virtualbox.org/ticket/14294 (VirtualBox)
To solve this problem I only needed to close Docker on Mac.