From: "Nick Crocker" <nick dot crocker at gmail dot com>

> Alright I made a new config file, copied the GENERIC file and added
> the line pseudo-device   vn to it and recompiled the kernel. I
> verified that it is using the new kernel using sysctl kernel.version
> and it shows the proper version. However I am still getting this
> error.

> monodev# ./workon4.sh wrap-1.22.img
> vnconfig: /dev/vn1: No such file or directory
> mount: /dev/vn1c: No such file or directory
> [root@monodev ~/Desktop/M0n0dev/mnt2]#

No problem.  It bit me too. Some of the image mounting tools fail because 
there is an insuficiant number of virtual devices.  The error is something 
like

vnconfig /dev/vn1: No such file or device

 This can be fixed by going into the /dev/ directory and typing;

/dev# MAKEDEV vn1