Guys, what does it mean?

[vernal shore]

Class 'ModItemTier' must implement abstract method 'getEnchantability()' in 'IItemTier'

[worn prism]

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[lunar sundial]

https://dev.java/learn/inheritance/abstract-classes/

[keen steppe]

You're likely trying to implement an interface (IItemTier) with something like "public class ModItemTier implements IItemTier". An interface can declare method signatures without providing the actual implementation. When a class implements an interface (in your case, ModItemTier), it must provide implementations for all the methods declared in that interface. The error message you're seeing is telling you that 'ModItemTier' is supposed to implement the 'getEnchantability()' method because it claims to implement the 'IItemTier' interface, but it hasn't done so yet.