Title: Fatal Error Unknown format specifier
Last modified: January 30, 2024

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# Fatal Error Unknown format specifier

 *  Resolved [WebDev1998](https://wordpress.org/support/users/keithvfs/)
 * (@keithvfs)
 * [2 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-unknown-format-specifier-2/)
 * I’ve seen others post this same error but the topic was closed with no response
   or solution given. We are getting the following error when publishing at times
 * _([29-Jan-2024 23:22:06 UTC] PHP Fatal error: Uncaught ValueError: Unknown format
   specifier “O” in **\***/public_html/wp-content/plugins/stream/classes/class-log.
   php:127
   Stack trace: 0 **\***/public_html/wp-content/plugins/stream/classes/class-
   log.php(127): vsprintf(‘Updated “conten…’, Array) 1 [internal function]: WP_Stream\
   Log->log(‘wordpressseo’, ‘Updated “conten…’, Array, 9072, ‘wpseo_meta’, ‘updated’,
   21156) 2 **\***/public_html/wp-content/plugins/stream/classes/class-connector.
   php(178): call_user_func_array(Array, Array) 3 **\***/public_html/wp-content/
   plugins/stream/connectors/class-connector-wordpress-seo.php(433): WP_Stream\Connector-
   >log(‘Updated “conten…’, Array, 9072, ‘wpseo_meta’, ‘updated’) 4 **\***/public_html/
   wp-content/plugins/stream/connectors/class-connector-wordpress-seo.php(368): 
   WP_Stream\Connector_WordPress_SEO->meta(9072, ‘_yoast_wpseo_co…’, ’30’) 5 [internal
   function]: WP_Stream\Connector_WordPress_SEO->callback_updated_post_meta(NULL,
   9072, ‘_yoast_wpseo_co…’, ’30’) 6 **\***/public_html/wp-content/plugins/stream/
   classes/class-connector.php(127): call_user_func_array(Array, Array) 7 **\***/
   public_html/wp-includes/class-wp-hook.php(324): WP_Stream\Connector->callback(‘
   1253795’, 9072, ‘_yoast_wpseo_co…’, ’30’) 8 **\***/public_html/wp-includes/class-
   wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) 9 **\***/public_html/wp-
   includes/plugin.php(517): WP_Hook->do_action(Array) 10 **\***/public_html/wp-
   includes/meta.php(336): do_action(‘updated_post_me…’, ‘1253795’, 9072, ‘_yoast_wpseo_co…’,’
   30’) 11 **\***/public_html/wp-includes/post.php(2558): update_metadata(‘post’,
   9072, ‘_yoast_wpseo_co…’, ’30’, ”) 12 **\***/public_html/wp-content/plugins/wordpress-
   seo/inc/class-wpseo-meta.php(717): update_post_meta(9072, ‘_yoast_wpseo_co…’,’
   30’) 13 **\***/public_html/wp-content/plugins/wordpress-seo/admin/metabox/class-
   metabox.php(806): WPSEO_Meta::set_value(‘content_score’, ’30’, 9072) 14 **\***/
   public_html/wp-includes/class-wp-hook.php(326): WPSEO_Metabox->save_postdata(
   9072) 15 **\***/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(
   NULL, Array) 16 **\***/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(
   Array) 17 **\***/public_html/wp-includes/post.php(4771): do_action(‘wp_insert_post’,
   9072, Object(WP_Post), true) 18 **\***/public_html/wp-includes/post.php(4862):
   wp_insert_post(Array, false, true) 19 **\***/public_html/wp-admin/includes/post.
   php(453): wp_update_post(Array) 20 **\***/public_html/wp-admin/post.php(227):
   edit_post() 21 {main}

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## Tags

 * [fatal](https://wordpress.org/support/topic-tag/fatal/)
 * [format](https://wordpress.org/support/topic-tag/format/)
 * [php](https://wordpress.org/support/topic-tag/php/)
 * [unknown](https://wordpress.org/support/topic-tag/unknown/)

 * 0 replies
 * 1 participant
 * Last reply from: [WebDev1998](https://wordpress.org/support/users/keithvfs/)
 * Last activity: [2 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-unknown-format-specifier-2/)
 * Status: resolved