Error: cannot ajaxify WordPress Popular Posts on this theme. It's missing the id

delete this on functions.php

'before_widget' => '<div>',
'after_widget' => '</div>',

Hi there,

@tonkberlin all that does is hide the warning message. It doesn’t fix the main problem.

Another user ran into the same issue not long ago, here’s how it was solved.

Okay, so change to

‘before_widget’ => ‘<div id=”%1$s” class=”widget %2$s”>’,
‘after_widget’ => ‘</div>’,

The actual HTML code in before_widget / after_widget varies from theme to theme (eg. 'before_widget' => '<li id="%1$s" class="widget %2$s">',), but yes that’s the idea. WPP needs the id="%1$s" part to do its AJAX magic.