Page dissappear

Hi. Activating this plugin in http://www.paalkvammen.no makes the whole front page and all other pages dissapear. I use this plugin in several other pages, with great success. I really dont know what to do, but maybe there is a conflicty with an another plugin?

https://wordpress.org/plugins/our-services-showcase/