Lerpz Tutorial Start Screen Kills TheGame Level

I have redone the Lerpz Tutorial twice to the point of the start screen. The start screen appears to work fine but on pressing “START” gives the error:

Level ‘TheGame’ (-1) couldn’t be loaded because it has not been added to the build settings.
To add a level to the build settings use the menu File->Build Settings…
UnityEngine.Application:LoadLevel(String)
StartMenuGUI:OnGUI() (at Assets/Scenes/StartMenuGUI.js:22)

It keeps prompting me to save the StartScene which I do, winding up with multiple StartScenes. It appears to have obliterated TheGame level. So now there is no Game Level. If I click on TheGame in the Hierarchy it shows me the lone MainCamera which has the StartScene settings.

Before I wreck try number 3, I wonder if someone could explain to me what I’m doing wrong. Thanks!

Well, I don’t know if this is right but I added the scenes to the build which I haven’t had to do before I guess cause there was previously just one scene and ran it out of the standalone window. Works fine. Must stop saving just because it asks me to.

I had the same problem. Also solved by adding to Project (File → Build Settings) both scenes (“The Game” and “TheStartMenu”)
Everything works for now.