Title: PHP Fatal Error with Facebook\PersistentDataInterface
Last modified: June 12, 2017

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# PHP Fatal Error with Facebook\PersistentDataInterface

 *  [gradtouch](https://wordpress.org/support/users/gradtouch/)
 * (@gradtouch)
 * [8 years, 11 months ago](https://wordpress.org/support/topic/php-fatal-error-with-facebookpersistentdatainterface/)
 * Hi there,
    In my log I have a recurring error every time the WordPress Cron runs.
   Any one have any idea or is it a bug? So for my particular instance this error
   appears every 15 minutes in my log.
 * `2017/06/12 14:45:01 [error] 31176#0: *3389 FastCGI sent in stderr: "PHP message:
   PHP Fatal error: Interface 'Facebook\PersistentData\PersistentDataInterface' 
   not found in /..../plugins/fb-instant-articles/wizard/class-instant-articles-
   wizard-fb-helper.php on line 20" while reading response header from upstream,
   client: 127.0.0.1, server: hostname.com, request: "GET /wp-cron.php?doing_wp_cron
   HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm/php-fpm.sock:", host: "
   hostname.com"`
 * Thanks,
    Theo

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 * 1 participant
 * Last reply from: [gradtouch](https://wordpress.org/support/users/gradtouch/)
 * Last activity: [8 years, 11 months ago](https://wordpress.org/support/topic/php-fatal-error-with-facebookpersistentdatainterface/)
 * Status: not resolved