Cannot find the symbol error 2021.1

I was about to make a JEI compatibility but i dont know how to define custom items/blocks to a element

 C:\Users\User\MCreatorWorkspaces\comfortables116\src\main\java\net\mcreator\comfortables\JeiPlugin.java:71: error: cannot find symbol outputs.add(new ItemStack(LuckyGemItem.block));
^
symbol: variable comfortables116
location: class JeiPlugin
C:\Users\User\MCreatorWorkspaces\comfortables116\src\main\java\net\mcreator\comfortables\JeiPlugin.java:79: error: package comfortables116 does not exist registration.addRecipeCatalyst(new ItemStack(LuckyTableBlock.block), LuckyTableJeiCategory.Uid);

symbol: variable LuckyTableBlock
location: class JeiPlugin