Two errors: "AssignClientAuthority(): Owner cannot be null" or "NetworkServer inactive"

This is what I am trying to do:



When the game starts, the game world is empty. As the player connects into the game world, the game spawns a Spawner for each player that is in the game world. Let's assume it's just a 2 player game. Once both players are ready, the Spawner will spawn a "Unit" game object. This "Unit" is controlled by the player owning the Spawner only.

The goal of this game is to have the white Spawner spawn in a yellow unit that...

Two errors: "AssignClientAuthority(): Owner cannot be null" or "NetworkServer inactive"