I downloaded Genymotion and Genymotion IntelliJ plugin. I set Genymotion path in Intellij. Instructions: https://cloud.genymotion.com/page/doc/#collapse-intellij
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Surprisingly not much on the internet about this. If you were to just run Genymotion (standalone) you'd get the nice error message:
Unable to load VirtualBox engine.
Make sure that you have installed it correctly before starting Genymotion.
For more information, refer to https://cloud.genymotion.com/page/faq#vbox
Unfortunately you won't see this in IntelliJ's Event Log. Once you install virtual box you should be all set.
So I have faced the same issue, been online searching for an answer with very little help. what I have done is, completely uninstall Genymotion and Vbox, did a restart of my machine, redownloaded, the newer version ( 2.5.4) of Genymotion with Vbox included from https://www.genymotion.com and then did a fresh install, this seems to have fixed the issue.
With Genymotion 1.0.5 release, it works well VirtualBox 5.x on OSX platform. Please upgrade plugin to latest.
https://www.genymotion.com/#!/release-notes/253_p105
Download and install Virtual Box for your platform and it will work. Download from https://www.virtualbox.org/wiki/Downloads .
First it seemed like the case is path to Genymotion, but this error is caused by a bug that does not let Genymotion plugin work with VirtualBox later than 4.2
To fix this error all you need to do is go here: https://www.virtualbox.org/wiki/Download_Old_Builds_4_2 and download the 4.2 version of VirtualBox. Once you reinstall it - the error is gone and Genymotion plugin opens device list properly