Grappler Kit, FishingHook Error

I have no idea how to do this! And I researched and found a code
But it is in error and I do not know how to solve it, I used pastebin because the code is a little big, I will be grateful if someone can help me

FishingHook class
https://pastebin.com/Y6fgyEw3

Grappler class
https://pastebin.com/t9ZSLwEg

Error

 

Code (Text):

31    public void h() {
32        if (!this.lastControllerDead && this.controller.dead) {
33            ((Player)this.owner.getBukkitEntity()).sendMessage(ChatColor.GREEN + "You are now hooked!");
34        }
35        this.lastControllerDead = this.controller.dead;
36        for (final Entity entity : this.controller.world.getWorld().getEntities()) {
37            if (!(entity instanceof Firework) && entity.getEntityId() != this.getBukkitEntity().getEn

It's a nonsensical thing