why is the output saying its not a valid member?

so im making a round script but theres this part

https://cdn.discordapp.com/attachments/843896024082153502/969661092102033458/unknown.png

where it teleports the player to the lobby spawn but the output is saying

13:06:50.700 Spawn is not a valid member of Workspace "Workspace" - Server - CountDownRound:42