Title: telematica's Replies | WordPress.org

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# telematica

  [  ](https://wordpress.org/support/users/telematica/)

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## Forum Replies Created

Viewing 1 replies (of 1 total)

 *   Forum: [Plugins](https://wordpress.org/support/forum/plugins-and-hacks/)
    In
   reply to: [[Yoast SEO - Advanced SEO with real-time guidance and built-in AI] Class 'WPSEO_OnPage' not found](https://wordpress.org/support/topic/class-wpseo_onpage-not-found/)
 *  [telematica](https://wordpress.org/support/users/telematica/)
 * (@telematica)
 * [10 years, 6 months ago](https://wordpress.org/support/topic/class-wpseo_onpage-not-found/#post-6761354)
 * Hello,
 * i have the same problem.
 * I installed YOAST and activate it and it works well… then i deactivate it and
   10 minutes later i want to reactivate it again and i got the same error.
 * Fatal error: Class ‘WPSEO_OnPage’ not found in /DOMAIN/subdomains/www/html/wp-
   content/plugins/wordpress-seo/wp-seo-main.php on line 353

Viewing 1 replies (of 1 total)