Failed to open page error

I installed your plugin, activated it and then selected one page to make secure.
I checked the https option, saved the page and when going to the https version, the web browser will not go to the page, giving the “Failed to open page error”

Will this work with WP ver. 3.5.1? If so, what else can I do to make an individual page secure?

https://www.ads-software.com/extend/plugins/wordpress-https/