error when trying to set primary part cframe?

vehicle = game.ServerStorage.VoidCrawler
here = game.Workspace.ThisThing
copy = vehicle:Clone()
	

		copy.Parent = game.Workspace
		copy:MakeJoints()
		copy.PrimaryPart = copy.MainSeat
		copy:SetPrimaryPartCFrame(here.Position)

whenever I turn this script on its supposed to move a copied model inside serverstorage to a parts position. whenever I try to tun it I get the error: unable to cast vector3 to coordinateframe

the error is at the line were setprimarypartcframe is