The tween looks fine, however, it’s hard to tell what Door.openDoor or Door.openDoora is. I’m assuming these are fixed parts within your model that act as an origin and an end goal CFrame.
Have you tried checking if the proximityprompt is the issue? Place a warn(“Test”) underneath and if you don’t see the “Test” text in output then it’s most likely the proximityprompt causing errors.
It could also be welds connected to the door. Make sure the thing you are tweening is anchored and not welded to anything. (WeldConstraints should be fine though)
@TheGameGod_YT
THe problem is that you use Door.position instead or Door.Cframe, for some reason roblox does not like tweening Position, please mark this as an answer if it helped you.