I'm sorry that you wasted your time going to a web toy you were not able to see! :'( The developer made a mistake in his error handling routing so that it is t

I'm sorry that you wasted your time going to a web toy you were not able to see! :'( The developer made a mistake in his error handling routing so that it is triggered by a false positive. This is likely because he made the demo on a time budget, because being a demo, it is not important to be perfect.