[FIXED] Replacing block below entity if targeted entity is at same height or higher

Hello, this is my first forum post (as you can probably tell from the fact my account was made like 2 minutes ago) I am very new to MCreator, or at least to the coding part (messed around with stuff in the past) and I've been having problem's with getting details of targeted entities (as said in the title)

Pastebin link to my crash log: https://pastebin.com/D0wWHVXW

code that isn't working:

As far as I can tell, somethings going wrong with getting the Y position of the targeted entity, but I don't understand why?

Also sorry if this post is badly structured.