Problem:
While building my project in Android Studio, I got the following error:
emulator: ERROR: Unfortunately, there's an incompatibility between HAXM hypervisor and VirtualBox 4.3.30+ which doesn't allow multiple hypervisors to co-exist.
Solution:
This turned out to be due to some vagrant instances I was running on my system. After halting my vagrant machines, Android Studio was able to build the project properly.