Unable to add child node, already has a parent, but it hasn't?

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By lonnwolf031

I am creating a multiplayer dice game.
I have a tab panel in which I add all players’ scorecards as tabs. For the current player I want to add a panel to the left showing its own scorecard.

This is the code that adds a player and with that adds a new scorecard to the tab pane.

sync func add_player(id, name=""):
	_players.append(id)
	#var _newPlayer = Player.new(id, name)
	#var _newPlayer = preload("res://scene/Player.tscn")
	#var newPlayer = _newPlayer.instance()
	var newplayer = KwixxPlayer.new()
	newplayer.id = id
	newplayer.name  = name
	_playersDict[id] = newplayer
	if name == "":
		name = "unknown"
	var _newPanel = PanelContainer.new()
	_newPanel.set_name(newplayer.name)
	_newPanel.set_size(Vector2(200, 200),false)  
	_tablist.add_child(_newPanel)
	var _newScorecard = preload("res://scene/Scorecard.tscn")
	var newScorecard = _newScorecard.instance()
	newScorecard.set_name(str(id))
	newScorecard.find_node("scorecard").set_expand(true)
	newScorecard.find_node("scorecard").set_stretch_mode(5)
	scorecards[id] = newScorecard
	_newPanel.add_child(newScorecard)

Then for the current user, in this debug scenario this, should add the players own scorecard:

func start():
	set_turn(0)
	loaddice()
	if !is_network_master():
		for peer in _players:
			rpc_id(peer, "_show_own_scorecard(id)", peer)
	elif is_network_master():
		var _owncard = scorecards[1]
		_owncard.set_name("mycard")
		_owncardpanel.add_child(_owncard)
		print_tree()
		pass

It gives the error “E 0:00:02.865 add_child: Can’t add child ‘mycard’ to ‘leftpanel’, already has a parent ‘ffff’.” (‘ffff’ is what I typed as test name in debug run)

I don’t understand, because there is a tab that has that name, but it is on another place in the tree and not a parent. Also I set the name to “mycard” to avoid having two same node names.

This is the tree it printed when running:

.
VBoxContainer
VBoxContainer/HBoxContainer
VBoxContainer/HBoxContainer/leftpanel
VBoxContainer/HBoxContainer/SubVBoxContainer
VBoxContainer/HBoxContainer/SubVBoxContainer/Action
VBoxContainer/HBoxContainer/SubVBoxContainer/Label
VBoxContainer/HBoxContainer/SubVBoxContainer/Tabs
VBoxContainer/HBoxContainer/SubVBoxContainer/Tabs/ffff
VBoxContainer/HBoxContainer/SubVBoxContainer/Tabs/ffff/mycard
VBoxContainer/HBoxContainer/SubVBoxContainer/Tabs/ffff/mycard/scorecard
VBoxContainer/HBoxContainer/SubVBoxContainer/Tabs/ffff/mycard/scorecard/BlueButtonContainer
VBoxContainer/HBoxContainer/SubVBoxContainer/Tabs/ffff/mycard/scorecard/BlueButtonContainer/CheckBox2Blue
VBoxContainer/HBoxContainer/SubVBoxContainer/Tabs/ffff/mycard/scorecard/BlueButtonContainer/CheckBox2Blue/check

(it goes on but that’s not relevant)

Could someone explain what I’m doing wrong here? Thanks in advance!

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