Hi Fabian,

Regarding "Uncaught TypeError: Cannot read property '_children' of undefined":

I encountered the same error while following the Creating your first course tutorial. Ignore these instructions in the contentObjects.json section: "Now you will need to re-build your code and refresh the browser, should now see at the bottom of the menu a new item (it won't do anything just yet)."

I found that I continued to get the error and the page could not load until I had the page, article, and block json in place. Once these three were in place, the page could load.

I'll see what I can do to get this wiki page updated soon. The documentation is getting better, but you may yet experience another bump. Post again if necessary. I think you'll find it's worth it!

Chuck