I had that problem too. I downloaded the 2.4 tarball and ran ./install_amp. Before you rush in… take a look at my previous post as I now have a problem with the admin web page.
Dallas
There is a thread on this on the Trixbox site. Commenting out lines 29 and 75 gets you past the problem, but I don’t know of any side effects. It appears as long as you don’t try to and press the ‘red button’ your switch keeps working.