Yettwasezmel 5 ɣef 5 n yetran

I don't understand this, I just updated to Thunderbird 3.0 - this says it will work with "Thunderbird: 1.5b – 3.0a1" but it's not working.

Aseqdac-agi ɣur-s iceggiren nniḍen n uzegriz-agi.