How to modify "MaxDamage" value for tools and armor?

Hello, as the title says I need help setting/modifying the "MaxDamage" property of tools and armor!

I have already done a decent amount of looking around and have accepted the fact I will have to do some coding and just need some help figuring out what I've been doing wrong, and why I keep getting errors whenever I try to build the project.

Here's the code I have so far as well as the error message I keep getting:

( https://pastebin.com/eUEbK1RY ) It was a lot of text so I decided to make a PasteBin for it! 

I'm using MCreator version 2023.2 with the 1.18.2 generator plugin by _Spectrall, and I have the custom code inside a procedure that I plan on setting to be triggered on "when item in inventory tick" for all my custom tools, weapons, and armor.

Any help would be greatly appreciated!! :D