I need help on my Simple Java Game currently following a tutorial from Kaarin platformer game

Hello, is there any possibly anybody can anybody identify the problem in my java code? after I implemented the enemy, Crabby and enemy manager I still couldnt spawn my Crabby monster in the map (still at part 1 ep 16 in his tutorial) Much appreciated!!

(my repo)

https://github.com/JevDoesCode/Apocalypto-java-game