Slide In plugin not working on any of my sites. I have turned off all the other plugins

I have been trying to get the SlideIn plugin working. I tried it on three of my sites with different themes and it did not work. Im using Version 1.1.3 of the plugin. The latest version of WordPress. I turned off all of my plugins but Slide In. Still did not work.

Most all plugins have worked on this theme. But not this one.