Problem Adding Extensions

I’m tying to add a Dahdi extension under Applications -> Extensions. The problem is that there is no channels listed in the channel drop down box.

As far as I can tell my Dahdi drivers are installed and working properly.

pbx-testCLI> dahdi show channels
Chan Extension Context Language MOH Interpret Blocked State Description
pseudo default default In Service
1 from-pstn en default In Service
2 from-internal en default In Service
3 from-internal en default In Service
4 from-internal en default In Service
pbx-test
CLI>

I’m running Ubuntu 11.04, Asterisk 11.1.2, FreePBX 3.211.63-3 with a TDM400P.
What am I missing?

Disable the DAHDI Module in module admin. Then try to add the extension again.