Title: fflone's Replies | WordPress.org --- # fflone [ ](https://wordpress.org/support/users/fflone/) * [Profile](https://wordpress.org/support/users/fflone/) * [Topics Started](https://wordpress.org/support/users/fflone/topics/) * [Replies Created](https://wordpress.org/support/users/fflone/replies/) * [Reviews Written](https://wordpress.org/support/users/fflone/reviews/) * [Topics Replied To](https://wordpress.org/support/users/fflone/replied-to/) * [Engagements](https://wordpress.org/support/users/fflone/engagements/) * [Favorites](https://wordpress.org/support/users/fflone/favorites/) Search replies: ## Forum Replies Created Viewing 2 replies - 1 through 2 (of 2 total) * Forum: [Plugins](https://wordpress.org/support/forum/plugins-and-hacks/) In reply to: [[Mailchimp for WooCommerce] Version 2.3.4 Fatal Error](https://wordpress.org/support/topic/version-2-3-4-fatal-error/) * Thread Starter [fflone](https://wordpress.org/support/users/fflone/) * (@fflone) * [6 years, 3 months ago](https://wordpress.org/support/topic/version-2-3-4-fatal-error/#post-12521527) * Yeah, I deactivate the pro version of Formidable and still got a fatal error that referenced another plugin I use – network-subsite-user-registration. * I deactivated network-subsite-user-registration as well and then there is no fatal error when I activate mailchimp-for-woocommerce 2.3.4. * So there is an incompatibility with both Formidable Pro and also network-subsite- user-registration. * Here is the fatal error generated when both the latest version of network-subsite- user-registration and mailchimp-for-woocommerce 2.3.4 are both active: * [08-Mar-2020 17:27:47 UTC] PHP Fatal error: Cannot declare class ActionScheduler, because the name is already in use in /srv/www/site.com/current/web/app/plugins/ woocommerce/includes/libraries/action-scheduler/classes/ActionScheduler.php on line 7 [08-Mar-2020 17:27:47 UTC] PHP Stack trace: [08-Mar-2020 17:27:47 UTC] PHP 1. {main}() /srv/www/site.com/current/web/wp/wp-admin/plugins.php:0 [08-Mar- 2020 17:27:47 UTC] PHP 2. require_once() /srv/www/site.com/current/web/wp/wp- admin/plugins.php:10 [08-Mar-2020 17:27:47 UTC] PHP 3. require_once() /srv/www/ site.com/current/web/wp/wp-admin/admin.php:34 [08-Mar-2020 17:27:47 UTC] PHP 4. require_once() /srv/www/site.com/current/web/wp/wp-load.php:42 [08-Mar-2020 17:27:47 UTC] PHP 5. require_once() /srv/www/site.com/current/web/wp-config.php: 9 [08-Mar-2020 17:27:47 UTC] PHP 6. do_action() /srv/www/site.com/current/web/ wp/wp-settings.php:392 [08-Mar-2020 17:27:47 UTC] PHP 7. WP_Hook->do_action()/ srv/www/site.com/current/web/wp/wp-includes/plugin.php:478 [08-Mar-2020 17:27: 47 UTC] PHP 8. WP_Hook->apply_filters() /srv/www/site.com/current/web/wp/wp-includes/ class-wp-hook.php:312 [08-Mar-2020 17:27:47 UTC] PHP 9. NSUR->constants() /srv/ www/site.com/current/web/wp/wp-includes/class-wp-hook.php:288 [08-Mar-2020 17: 27:47 UTC] PHP 10. NSUR->plugin_get_version() /srv/www/site.com/current/web/app/ plugins/network-subsite-user-registration/network-subsite-user-registration.php: 130 [08-Mar-2020 17:27:47 UTC] PHP 11. get_plugin_data() /srv/www/site.com/current/ web/app/plugins/network-subsite-user-registration/network-subsite-user-registration. php:577 [08-Mar-2020 17:27:47 UTC] PHP 12. get_file_data() /srv/www/site.com/ current/web/wp/wp-admin/includes/plugin.php:86 [08-Mar-2020 17:27:47 UTC] PHP 13. apply_filters() /srv/www/site.com/current/web/wp/wp-includes/functions.php: 5803 [08-Mar-2020 17:27:47 UTC] PHP 14. WP_Hook->apply_filters() /srv/www/site. com/current/web/wp/wp-includes/plugin.php:206 [08-Mar-2020 17:27:47 UTC] PHP 15. wc_enable_wc_plugin_headers() /srv/www/site.com/current/web/wp/wp-includes/ class-wp-hook.php:288 [08-Mar-2020 17:27:47 UTC] PHP 16. class_exists() /srv/ www/site.com/current/web/app/plugins/woocommerce/includes/wc-core-functions.php: 2028 [08-Mar-2020 17:27:47 UTC] PHP 17. spl_autoload_call() /srv/www/site.com/ current/web/app/plugins/woocommerce/includes/wc-core-functions.php:2028 [08-Mar- 2020 17:27:47 UTC] PHP 18. {closure:/srv/www/site.com/current/web/app/plugins/ mailchimp-for-woocommerce/bootstrap.php:10-80}() /srv/www/site.com/current/web/ app/plugins/woocommerce/includes/wc-core-functions.php:2028 [08-Mar-2020 17:27: 47 UTC] PHP 19. include_once() /srv/www/site.com/current/web/app/plugins/mailchimp- for-woocommerce/bootstrap.php:79 [08-Mar-2020 17:27:48 UTC] PHP 20. ActionScheduler_Versions:: initialize_latest_version() /srv/www/site.com/current/web/app/plugins/mailchimp- for-woocommerce/includes/vendor/action-scheduler/action-scheduler.php:51 [08- Mar-2020 17:27:48 UTC] PHP 21. action_scheduler_initialize_2_dot_2_dot_5() /srv/ www/site.com/current/web/app/plugins/woocommerce/includes/libraries/action-scheduler/ classes/ActionScheduler_Versions.php:59 [08-Mar-2020 17:27:48 UTC] PHP 22. require_once()/ srv/www/site.com/current/web/app/plugins/woocommerce/includes/libraries/action- scheduler/action-scheduler.php:43 * Forum: [Plugins](https://wordpress.org/support/forum/plugins-and-hacks/) In reply to: [[Mailchimp for WooCommerce] Version 2.3.4 Fatal Error](https://wordpress.org/support/topic/version-2-3-4-fatal-error/) * Thread Starter [fflone](https://wordpress.org/support/users/fflone/) * (@fflone) * [6 years, 3 months ago](https://wordpress.org/support/topic/version-2-3-4-fatal-error/#post-12517243) * Hi, thanks for the response. I’m using the latest public release 3.9.3. Viewing 2 replies - 1 through 2 (of 2 total)