Clients usually will not have the entire Workspace available locally. Developers must ensure that game functionality works when clients are missing parts of the world, such as by using Instance:WaitForChild (Please be aware that there is a chance WaitForChild will hang forever if the instance being waited for is never streamed in and that a timeout in WaitForChild is not specified).
Quoted from the streaming enabled topic:
Specify a timeout for your WaitForChild, for your part.
game.ReplicatedStorage.RemoteEvents:WaitForChild("SpawnTeleport"):FireServer(workspace:WaitForChild("SpawnLocations"):WaitForChild("Open1", 1))
