[Unable to launch Tekkit Legends]

Im having a similar problem, when i click play it says "examining version file" and then stops. 

[When i click Play it doesn't load.]

I tested all the modpacks again after i updated one and they all worked except for tekkit.

 

[When i click Play it doesn't load.]

Whenever i click play on any modpack, is says "examining version file" for a slip second then cancels, I had no problems less than an hour before when i played and i even restarted my computer to see if that helped. Also sometimes when i click play is says "checking for version file".