Engine error: The current thread cannot require '...' (lacking capability unknown) -> occurs when a module returns a function with a TweenInfo

[aaron_mccoy (PleaseDontBanAaron)]

A user playing one of the games I’m working on has this unusual error on their MacOS that has appeared out of nowhere, even though no updates were added to the codebase recently:

This bug appears to be consistent as it always triggers for them whenever joining the game.

The error is relating to a require that loads a module that only returns a TweenInfo in function like so:
I’m not too sure why it’s breaking on a specific Mac device, but as far

return function(root, visible)
	return TweenInfo.new(
		if visible then .15 else .21, 
		Enum.EasingStyle.Cubic,
		Enum.EasingDirection[if visible then "Out" else "In"]
	)
end

Here’s an image of the analytics catching this bug recently:

Based on some recent searches, it appears this error has been somewhat recurring recently:

The current thread cannot require

[Screenshot 2023-08-18 at 19.33.43] A large part of my workflow involves running commands in the command line, as off today commands I regularly run have stopped working due to this error, This is consistently happening across a range of my commands which all go through my custom requiring logic. In this game: [🚂] Cart Ride - Roblox Run the command in the below script in the command line (I give full permission for any roblox staff to go poking around in the game and I can provide an place f…

New Facial Tracking Causing "The current thread cannot access 'Instance' (lacking capability Plugin)" error

Players in my game are getting this error during gameplay while having the new facial tracking feature enabled: [image] I believe the error is being caused by accessing camera properties (when I commented this line out from a mechanic in my game, the mechanic no longer caused the error. The camera variable is also just a reference to workspace.CurrentCamera defined at the start of the script): [image] Game Link: Combat Warriors - Roblox

Game Link:

[Farm Animals!] The Survival Game

[WheretIB]

Thank you for your report, but unfortunately, we cannot reproduce this issue.

I see that there are some likes of this topic by other developers.
If we can get more examples of the issue reported by them as well, it will be easier for us to find the problem.

[WheretIB]

We can’t repro this bug, so we’re going to assume the issue is no longer occurring.

The two similar issues that are linked were fixed.