Parameter data tree is null, please help

I keep getting data.tree is null after removing the WorldScene and adding it back
in my MainWorld node, the child node of the WorldScene getting that issue is a Canvas Layer node, is there any way to fix it, please help me

class_name MainWorld extends Node2D

var worldScene = preload("res://Scenes/world.tscn")
var gameOverScene = preload("res://Scenes/UI/GameOverScene.tscn")

func _ready():
	Global.mainWorld = self
	call_deferred("add_child", worldScene.instantiate())

func ChangeToGameOverScene():
	call_deferred("remove_child", $World)
	call_deferred("add_child", gameOverScene.instantiate())

func ChangeToWorldScene():
	remove_child($GameOverScene)
	call_deferred("add_child", worldScene.instantiate())