Appconference 2.0: problems with CLI

I am using the Appconference 2.0. This app is a conference like meetme but with video, work fine. I proof already a switching video with DTMF, option RX with many users and actually work well. I proof the VAD switching and work, not so fine, I thing that depends on audio quality and codec.
So in CLI some commands of the conference (‘help conference’), don’t work and this is my question: [color=red]Anybody proof those commands[/color]?
This is really important because command like:
conference set default : sets the default video source for conference to member
conference set defaultchannel sets the default video source channel for conference to channel

Don’t work, whenever I try this is the output:
Setting default video id failed
Thanks for the attention.