Do you use latest version (1.09) ? I'm asking because I just created brand new project. then imported 1.09 from asset store. and then imported just the scene from the package which you sent to me. And Everything was working as expected. But. If I import everything from your package (and override something) i got exact error as you are. Did you allow to override project settings when you imported the package to your project? Could you provide more info about your environment. (Unity version, target build, did you change anything on import, did you allow to override project settings, and maybe something else). Thanks.