Error shown

SOLUTION for above,is:
in class-frontend.php, you should insert this (instead of $commenttitle.$commentcount)

(isset($commenttitle) ? $commenttitle : '') .   (isset($commentcount) ? $commentcount : '')

2) Another problem:
http://i.imgur.com/ShLJaMc.png

–>for this, solution is to insert this in class-admin.php 482 line

if (isset( $_POST['_disable_fbc'] )) {
.........
}