Get Enchantment Level of Enchantment [enchantment] returns lambda expresion

i have experienced some compilation issues:

hhffigj is type double.

C:\Users\Dell\MCreatorWorkspaces\jakissemod\src\main\java\net\mcreator\jakissemod\procedures\HealingStuffRightClickedProcedure.java:40: error: local variables referenced from a lambda expression must be final or effectively final 

hhffigj = EnchantmentHelper.getItemEnchantmentLevel(JsmModEnchantments.HEALING.get(), itemstackiterator) + 0;