bhyve bhyve running FreeBSD VM error

I'm trying to run FreeBSD with KDE or Xfce inside a bhyve virtual machine.

The bhyve command executed to start the VM has "-s 29,fbuf,tcp=,w=800,h=600 -s 30,xhci,tablet" included.

From within the VM, I tried to execute "startx" and I'm hit with the following error:
(EE) Cannot run in framebuffer mode. Please specify busIDs        for all framebuffer devices

Do I need to install some drivers?
What am I missing?
How can I resolve my problem?

Note: the host OS is FreeBSD 13 with KDE running smoothly.