Output error is "obstructing" the other errors and i dont know how to fix it

Seems like the weld’s Part1 property is empty. Instead of relying on welds, can’t you just check the Occupant property and directly set the sitting animation in the Player’s Animate script?

I made many posts with code I have given relating to this issue and they seemed to work for them,

You can try this

local seat = script.Parent
local animId = seat.Animation.AnimationId
local defaultAnim = "http://www.roblox.com/asset/?id=2506281703"
local formeroccupant

seat:GetPropertyChangedSignal("Occupant"):Connect(function()
	local humanoid = seat.Occupant
	if humanoid then
		local char = humanoid.Parent
		char.Animate.sit.SitAnim.AnimationId = animId
		formeroccupant = char
	else			
		formeroccupant.Animate.sit.SitAnim.AnimationId = defaultAnim
		formeroccupant = nil
	end
end)

And it should work fine if your rigs are R15, if not, the 1st post I sent has code that should work if you’re using R6

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