As discussed on the other thread, a couple of us were able to run your project (albeit a stripped back version). The error about the nil value is because the menu2.lua file is not properly setup for Composer. That is the only way this error can occur. You can’t just have a composer file that has print (“hello world”), it needs all the composer functions too.
You could also simply start your simulator, then select New Project and then select “Physics Based Game” or “eBook” and Corona will generate a project for you that properly utilises composer. Then you can learn or copy from there.