Installed OK but still not working

OK I installed MJ and even followed the video guide on your site and still will not work. I keep getting this error message:

Fatal error: Class 'CommunityViewIphoneFrontpage' not found in /home/craicboo/public_html/components/com_community/libraries/core.php on line 418

However, if I use the I phone tester website it displays just fine.

Can someone advise me what I am doing wrong.