Canvas page Error for Facebook App

I was working on my sample Facebook Application and continue to get this message:

Sorry, something went wrong.

We're working on getting this fixed as soon as we can.

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If I enter wrong input then it warn me of validation error, but when I enter correct input then it does not tell anything. Lets see, whether it solves automatically from there side or I need to do something. I will once I will find solution.

Currently, I need to satisfy with this tab and its content:

Update (01-Oct-2010): Finally it is working. The error was from Facebook side and they have confirmed it and fixed it.
So, sample Facebook application is here:

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