I can't summon quicksand? sandstorm blitz

Hi there, repost since I’m not really sure where this belongs, but I can’t seem to summon a quicksand, while others can. could I get some help?

players = hero.findTheirPlayers()
nearest = hero.findNearest(players)
while True:
    hero.launch(28, 86)
    hero.summon('threat', 0)
    hero.summon("big", 1)    
    hero.summon('charger', 2)
    if hero.isReady("quicksand"):
        hero.play("quicksand", 1)
    hero.summon("driver", 0)
    hero.summon("sniper", 1)
    hero.summon("charger", 2)    
    if hero.isReady("quicksand"):
        hero.play("quicksand", 1)
        hero.launch(25, 16)
    hero.summon('threat', 0)
    hero.summon("big", 1)    
    hero.summon('charger', 2)
    if hero.isReady("quicksand"):
        hero.play("quicksand", 1)
    hero.summon("driver", 0)
    hero.summon("sniper", 1)
    hero.summon("charger", 2)    
    if hero.isReady("quicksand"):
        hero.play("quicksand", 1)    

I don’t know what’s wrong with your code. Your code works for me.