Error 1: gpart create -s GPT ad0

[Ivan Klymenko]

Hello! People.

I use the alternate installer pc-sysinstall based on FreeBSD
9.0-CURRENT r215176
When you load the virtual machine qemu disk ad0 is determined by:
http://img573.imageshack.us/i/qemu1.png/
but when trying to create a section displays the following error:
http://img80.imageshack.us/i/qemu.png/
Think all options for gpart are correct - what can there be a problem?

Thanks!