"Critical error" starting LilyDev

[John Gourlay]

I’m a new user of LilyPond hoping to get involved in development. I’ve 
installed VirtualBox and with it I’ve created a virtual machine with the 
LilyDev disk image. The Debian installation completed, but it won’t run; 
VirtualBox gives me a popup error message saying, “A critical error has 
occurred while running the virtual machine…” Do you have any suggestions for 
overcoming this problem?

I’m running Mac OS X version 10.10.5, VirtualBox version 5.0.8, and the LilyDev 
disk image lilydev-4.0-i386.hybrid.iso. What other information would be most 
helpful in diagnosing the problem?

John Gourlay