Infinite scroll doesn't work once again

I can’t manage to install this plugin on my website.
https://ww.wp.xz.cn/plugins/infinite-scroll/

My website:
http://fastfoodmusic.com/

Sites that managed to do it:
http://lunchboxnotes.shanewhatley.com/
http://blog2.axelpfaender.com/

Things I typed in options:

Content Selector: #main #post-list
Navigation Selector: #post-navi
Next Selector: #post-navi div.prev a
Item Selector: div.post</ul>

Plugin seems to have problems with these columns:

<div id="col1" class="col"></div>
<div id="col2" class="col"></div>
<div id="col3" class="col"></div>
<div id="col4" class="col"></div>