If nothing else is wrong, the yeast may have been past its effective date. With all that natural and added sugar in there, there should have been plenty for the yeast to feed on, if the yeast was still good.
I always check the experiation date on any packet of yeast I buy. Using out of date yeast happened to me already, it did no harm, but it's a pain in the butt to go running at the last minute to save the batch. Having to run for fresh yeast is the least of any problems that can pop up, and is easily remedied. Being a few weeks past the expiration date is usually nothing to worry about, but when you get 2, 3 or 6 months past due, it usually can lead to a failure to ferment.
IF it doesn't work this time, something drastic is wrong.
Good Luck, hopefully that was the problem.