Steps to reproduce:
1) Open the attached project.
2) Build the project as Windows, Mac & Linux Standalone.
3) Open the built project.
4) Press 'Play and Host'.
5) Switch back to Editor.
6) Enter play mode.
7) Press 'Join'.
8) Select 'Wizard' as character in both Player and Editor.
9) Press 'Join' on both Player and Editor.

- The game starts, however, an error message appears in the editor's console:
Failed to spawn server object, assetId=d9f8abac590f14368995fc4b51c39072 netId=5
UnityEngine.Networking.NetworkIdentity:UNetStaticUpdate()