[libvirt-users] error : Failed to find user record for uid '32722'

[Tony Cebzanov]

I'm trying to use the libvirt Python API to manage VirtualBox VMs on Mac 
OS X 10.8.3.  I'm running libvirt 1.0.6 via Homebrew.  However, the 
following trivial Python script:

     import libvirt
     conn = libvirt.open('vbox:///session')

gives me the following error:

libvirt:  error : Failed to find user record for uid '32722': Success
Traceback (most recent call last):
   File "ch3vm.py", line 3, in <module>
     conn = libvirt.open('vbox:///session')
   File "/usr/local/lib/python2.7/site-packages/libvirt.py", line 236, 
in open
     if ret is None:raise libvirtError('virConnectOpen() failed')
libvirt.libvirtError: Failed to find user record for uid '32722': Success

I have no idea where that uid 32722 is coming from -- it's not the uid 
of my user account, any of my VirtualBox files, or anything else that 
I'm aware of.

Anyone have any idea what's going on here?