Hello @ladyelva, you probably know at the start not all chocolate squares are given, that means you must let it grow. If you destroy it all at once, there's no way it can grow unless you have a lucky candy booster on the board. So just open up the board, let it grow, and once you have enough destroy it all
They first appear in level 4596. If you're trying to swipe a candy that is in a crystal to a candy that's not inside a crystal, it won't work. Swiping a candy that's not in a crystal onto a candy that is incased by a crystal will work. That's what the game's trying to tell you