NetBSD on Amazon EC2

[Eric Haszlakiewicz <hawicz%gmail.com@localhost>]

Up until today I was running a NetBSD server on Amazon's EC2 service,
but then I restarted it because Amazon told me they'd be forcing a
restart soon anyway, to "deploy important updates".
Of course, when I tried to start it back up, it failed.  Trying to
start a brand new instance using the available NetBSD AMIs
(NetBSD-i386-7.0-201511211930Z-20151121-1234 (ami-9f8090fe)) also
fails in a similar way, specifically with errors like:

Failed to read /local/domain/0/backend/vbd/7994/2050/feature-barrier.
Failed to read /local/domain/0/backend/vbd/7994/2050/feature-flush-cache.
and
xc_dom_probe_bzimage_kernel: kernel is not a bzImage

Do these errors ring a bell with anyone?
Does anyone have a working AMI that I can use?

Thanks,
Eric