LegendOfDead

It says for me error on Class not find : Bouncy Castle

I had the technic platfrom, and i wanted the new modpacks (Hexxit) and i started Technic Platform, it was not there, i downloaded again the launcher.exe and my modpacks bugged out, i deleted the .technic file in %appdata% and redownloaded again, it says load, and as soon as i scroll down or click on the arrows for changing modpacks, its all ''Add Modpack'' buttons, i tried to find solutions, but i couldn't Please help!! From LegendOfDead