An error is reported for the example animation

[lrplrplrp]

Godot version:4.4
anima/core/keyframes-engine.gd
Error animation:2DGrid
Error line:56
Error code:
if frame_keys[0] != 0:
Error:Out of bounds get index '0' (on base: 'Array')
Resolution:
Line 29
if percentage is StringName: #if percentage is String:

[ceceppa]

Could you provide an example code that I can use to reproduce this issue?

[lrplrplrp]

@ceceppa
This is an example that comes with the project, and the godot version is 4.4
https://github.com/user-attachments/assets/3c3be12b-a7fd-42f2-bca6-d8bf574c4a9f

[phosphorylation]

@ceceppa hi,
I had the same error and it seems to be fixable by adding a StringName check,
In keyframeEngine, line 29:

static func flatten_keyframes_data(data: Dictionary) -> Array:
	var result := {}
	for key in data:
		var is_dictionary = data.has(key) and data[key] is Dictionary
		var value: Dictionary = data[key].duplicate() if is_dictionary else {}

		if not key is Array:
			key = [key]

		for percentage in key:
			if percentage is String:
				if percentage == "from":
					percentage = 0
				elif percentage == "to":
					percentage = 100

to

	var result := {}

	for key in data:
		var is_dictionary = data.has(key) and data[key] is Dictionary
		var value: Dictionary = data[key].duplicate() if is_dictionary else {}

		if not key is Array:
			key = [key]

		for percentage in key:
			if percentage is String or percentage is StringName:
				if percentage == "from":
					percentage = 0
				elif percentage == "to":
					percentage = 100

there are some other bugs as well. Some of the declarative construction of animation is not working, but all the dictionary construction seems to be working well.