I created camping.cmp and add it to harnessApp.app.  I've previewed the result and everything looks okay to me.  However, I'm getting the error message:

Here is my result:

Why am I getting the error? Help!  Thanks!

Hello,

I'm having trouble checking the challenge, I've checked other discussions and I've done exactly what others have done to pass but everytime I click check challange it gives me this error message:

Looks like something went wrong, please try again later.

I've logged out of both Developer Edition and Trailhead acc, used another new Developer Edition to redo the challenge and it gives me the same message.