Entity not attacking monster

I just made a entity in my mod and in the AI and tasks section I made it so it attacks monster (zombies, husks, creepers etc.) and I tested it in creative and it ran up to a husk and stopet about 4 or 5 blocks away just staring at the husk. I even tried spawning my mob right infront of  the husk and it just stared at the husk. I don't know if this matters but it was a biped model holding a custom sword. (BTW: I set the mob's attack damage to 0 but its sword does damage (the way I know that is because I tested it on myself).)

Thanks for spending you time reading this and please answer!

Sorry if my english is trash.