Fatal Error unable to delete old version

Same error here just today, WP 3.8 with Polylang (2 languages)…

Fatal error: Call to undefined function schedule_yoast_tracking() in public_html/wordpress/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php on line 29

i cannot even activate the plugin!

Same here

Plugin could not be activated because it triggered a fatal error.

Fatal error: Call to undefined function schedule_yoast_tracking() in blah/html/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php on line 29

NOOO!!!!

Yup same here.

Line refers to ‘get_post_custom’.

Same after upgrade to WP 3.8.

Fatal error: Call to undefined function schedule_yoast_tracking() in /var/www/public_html/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php on line 29

Please help!

Same for WP 3.7.1 Plugin 1.4.20

Fatal error: Call to undefined function schedule_yoast_tracking()...

please fix this problem, same here

From github, they are fixing this issue.

Found a solution!!!

wpseo-functions.php has the function schedule_yoast_tracking()
so i linked wpseo-functions.php to wpseo-non-ajax-functions.php

just add
require_once( WPSEO_PATH . 'inc/wpseo-functions.php' );
after
require_once( WPSEO_PATH . 'inc/class-sitemap-walker.php' );

example:

<?php
/**
 * @package Internals
 */

require_once( WPSEO_PATH . 'inc/class-sitemap-walker.php' );
require_once( WPSEO_PATH . 'inc/wpseo-functions.php' );

if ( ! defined( 'WPSEO_VERSION' ) ) {
	header( 'HTTP/1.0 403 Forbidden' );
	die;
}

/**
 * Flush the rewrite rules.
 */

Regards Kevin Da Thesta – Vedicom Security Systems

Same issue: Call to undefined function schedule_yoast_tracking()

Does anyone have a fix for this error?

I tried to download the new WordPress and when I reactivated my plugins I received this error: Call to undefined function schedule_yoast_tracking()

same error here, only on WordPress 3.8
when activating the plugin

Fatal error: Call to undefined function schedule_yoast_tracking() in /home/house/public_html/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php on line 29

same error here, using WordPress 3.8, brand new site, no other plugins installed.

Yay they updated it! Thank god ??

for me not working same error

the new version 1.4.21 not helping me and this Code require_once( WPSEO_PATH . ‘inc/class-sitemap-walker.php’ ); dont work for me.