Hi
Please have a look at this community article :-
Link:- http://wcmaem.blogspot.in/2013/12/copy-parsys-component.html
//It covers Customization of parsys to restrict number of compnents
Though this article is written for 5.6, but i think it would work on 6.2 as well (only few files path might have changed).
And for the link you have mentioned, please check for browser error or AEM error.log.
~kautuk
Kautuk Sahni