i have changed the templating.cfg file according to the instructions given in manual, but still i'm not able to view the preview button.i have attached my templating.cfg file.Please check the file for any error.
Look up the manuals for *viewoptions*. I do not see that in your templating.cfg file.
The problem is been fixed . It was because of "view options" in templating.cfg file. But stlill preview button is not enabled in Generate page.