Dear ubart:

Sorry for the script error.

Because I want to simulate such error, please tell me the site URL which you got the error message popup :

"Exception: TypeError: Child has no propertes"

And I check the point of trouble!

Thank you for your comment, wotan.
I'm sorry, I'm not good at German and other languages.
However I reviced this script for "der die das ein eine er sie es"!

Please try it!!