[Opserty]

First try this:

PHP Code:

eval('$template_hook[postbit_userinfo_right_after_posts] .= "' . fetch_template('CustomPostbit') . '";'); 


If still not try this:

PHP Code:

eval('$template_hook[\'postbit_userinfo_right_after_posts\'] .= "' . fetch_template('CustomPostbit') . '";'); 


Finally are you running any other plugins?

If things don't start working trial and error is the way to go haha.