Not working for Story and Blog type of content

Fasttoggling is not working through ajax method for the Story and Blog type of content. Once clicked on the toggling option for either Story or Blog content type, ajax circle is rotating with the following javascript error:

link.html(data.text).removeClass is not a function
[Break on this error] link.html(data.text).removeClass('throbbing');

It is working fine for the other types of content, comments and users.