Registering new item (HELP)

I am trying to register a new item but I am getting this error

"Symbol does not appear in the shape: X" (EXCEPTION) in "/src/pocketmine/inventory/ShapedRecipe" at line 99"



Code:

$this->getServer()->getCraftingManager()->registerRecipe((new ShapedRecipe(Item::get(Item::GOLDEN_APPLE, 2, 1)->setCustomName(C::GOLD . 'Golden Head'),
"XXX",
"XYX",
"XXX"
))->setIngredient("X", Item::get(Item::GOLD_INGOT, 0, 8))->setIngredient("Y", Item::get(Item::SKULL, 3, 1)));
}

this used to work before but not it doesn't.. I am using Tesseract

 

This forum is not for spoons.

 

oh, my bad