problem z craftingiem

W tej linijce wyrzuca błąd: "Head".Recipe.registerIngredient{5, 1 skull};" Jak nazwać inaczej tą głowe?

on load:
	new Recipe "Head";
	"Head".Recipe.registerIngredient{1, 1 block of gold};
	"Head".Recipe.registerIngredient{2, 1 block of gold};
	"Head".Recipe.registerIngredient{3, 1 block of gold};
	"Head".Recipe.registerIngredient{4, 1 block of gold};
	"Head".Recipe.registerIngredient{5, 1 skull};
	"Head".Recipe.registerIngredient{6, 1 block of gold};
	"Head".Recipe.registerIngredient{7, 1 block of gold};
	"Head".Recipe.registerIngredient{8, 1 block of gold};
	"Head".Recipe.registerIngredient{9, 1 block of gold};
	"Head".Recipe.registerResult{1 enchanted golden apple};
	"Head".Recipe.register{};