How do I fix "Failed to sync vcpu reg" error?

I'm trying to use the Intel HAX x86 emulator for Windows (8, if that matters). I installed everything and created an AVD for the android version, and everything appears correct, but when I run it, I get this output:

Starting emulator for AVD 'x86_QVGA_Level10'
emulator: device fd:1044
HAX is working and emulator runs in fast virt mode
emulator: Failed to sync vcpu reg
emulator: Failed to sync HAX vcpu context

and the emulator won't run. The significant part of this error (Failed to sync vcpu reg) is not mentioned ANYWHERE online, except in the source code for the HAX itself, but I can't figure out how to make any sense of this.

Can anyone advise about how to get past this error? I really need to get this working, because debugging on device and in the default emulators is painfully slow.

Solution 1:

Make sure you don't have any virtual machines running. In my case, I had genymotion running which was causing this error.

Solution 2:

I had virtualbox running. Killing the VM allowed allowed the emulator to run.