The problem i'm having is that, with the new format of the /particle command, if you want to play a blockcrack, or an icon crack particle specifying the params(eg. /particle blockcrack <x> <y> <z> <xd> <yd> <zd> [speed] [count] [mode] @e[type=Bat] 1 ) it should play the stone blockcrack particle at a bat(in the example given), though, all it does is tell you that "that player cannot be found". It still works if you specify a player, though that limits you from playing a customized blockcrack or iconcrack particle on other entities as it works on players only at the current moment.