Title: Site error Last modified: July 15, 2026 --- # Site error * Resolved [eshuisp](https://wordpress.org/support/users/eshuisp/) * (@eshuisp) * [3 weeks, 5 days ago](https://wordpress.org/support/topic/site-error-27/) * Site will not load because of plugins fail. See screenshot below for the error * ![](https://i0.wp.com/legrandlarue.com/wp-content/uploads/2026/07/Calender-Pro- error.jpg?ssl=1) - This topic was modified 3 weeks, 5 days ago by [eshuisp](https://wordpress.org/support/users/eshuisp/). - This topic was modified 3 weeks, 5 days ago by [eshuisp](https://wordpress.org/support/users/eshuisp/). Viewing 4 replies - 1 through 4 (of 4 total) * Plugin Support [Dmytro](https://wordpress.org/support/users/dimasereda/) * (@dimasereda) * [3 weeks, 5 days ago](https://wordpress.org/support/topic/site-error-27/#post-18965906) * Hello. * I do not see the screenshot in your previous message. But please update your version of Booking Calendar to the latest update 11.4.1, it should resolve the issue that was exists in update 11.4 * Kind Regards. * Thread Starter [eshuisp](https://wordpress.org/support/users/eshuisp/) * (@eshuisp) * [3 weeks, 5 days ago](https://wordpress.org/support/topic/site-error-27/#post-18965918) * Booking calender is V11.4.1 The pro version is V10.14.6After enabling the pro version, an error occurs and the site is not loading.Here are the errors:Booking calender:Een fout van het type `E_ERROR` werd veroorzaakt op regelnummer `18` van het bestand `/data/sites/web/legrandlaruecom/www/wp-content/plugins/booking/ includes/_feedback_deactivation/feedback_view.php`. Foutmelding: `Uncaught Error: Undefined constant "WPBC_PRO_PLUGIN_DIRNAME" in /data/sites/web/legrandlaruecom/ www/wp-content/plugins/booking/includes/_feedback_deactivation/feedback_view. php:18 Stack trace: #0 /data/sites/web/legrandlaruecom/www/wp-content/plugins/ booking/includes/_feedback_deactivation/feedback.php(103): require_once() #1 / data/sites/web/legrandlaruecom/www/wp-includes/class-wp-hook.php(341): WPBC_Admin_Deactivation_Feedback- >feedback_html('') #2 /data/sites/web/legrandlaruecom/www/wp-includes/class-wp- hook.php(365): WP_Hook->apply_filters(NULL, Array) #3 /data/sites/web/legrandlaruecom/ www/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #4 /data/sites/web/ legrandlaruecom/www/wp-admin/admin-footer.php(78): do_action('...', '') #5 /data/ sites/web/legrandlaruecom/www/wp-admin/plugins.php(825): require_once('...') # 6 {main} thrown`Booking Calender pro:Een fout van het type `E_ERROR` werd veroorzaakt op regelnummer `59` van het bestand `/data/sites/web/legrandlaruecom/www/wp-content/ plugins/booking-calendar-com/inc/_ps/personal.php`. Foutmelding: `Uncaught Error: Failed opening required '/data/sites/web/legrandlaruecom/www/wp-content/plugins/ booking/includes/page-form-simple/page-form-simple.php' (include_path='.') in/ data/sites/web/legrandlaruecom/www/wp-content/plugins/booking-calendar-com/inc/ _ps/personal.php:59 Stack trace: #0 /data/sites/web/legrandlaruecom/www/wp-content/ plugins/booking-calendar-com/includes/auto-load.php(24): require_once() #1 /data/ sites/web/legrandlaruecom/www/wp-includes/class-wp-hook.php(341): wpbc_pro_load_php_files('')# 2 /data/sites/web/legrandlaruecom/www/wp-includes/class-wp-hook.php(365): WP_Hook- >apply_filters('', Array) #3 /data/sites/web/legrandlaruecom/www/wp-includes/ plugin.php(522): WP_Hook->do_action(Array) #4 /data/sites/web/legrandlaruecom/ www/wp-content/plugins/booking/includes/wpbc-include.php(310): do_action('...')# 5 /data/sites/web/legrandlaruecom/www/wp-content/plugins/booking/core/wpbc.php( 342): require_once('...') #6 /data/sites/web/legrandlaruecom/www/wp-content/plugins/ booking/core/wpbc.php(43): Booking_Calendar->includes() #7 /data/sites/web/legrandlaruecom/ www/wp-content/plugins/booking/core/wpbc.php(520): Booking_Calendar::init() # 8 /data/sites/web/legrandlaruecom/www/wp-content/plugins/booking/core/wpbc.php( 526): WPBC() #9 /data/sites/web/legrandlaruecom/www/wp-content/plugins/booking/ wpdev-booking.php(112): require_once('...') #10 /data/sites/web/legrandlaruecom/ www/wp-settings.php(589): include_once('...') #11 /data/sites/web/legrandlaruecom/ www/wp-config.php(86): require_once('...') #12 /data/sites/web/legrandlaruecom/ www/wp-load.php(50): require_once('...') #13 /data/sites/web/legrandlaruecom/ www/wp-login.php(12): require('...') #14 {main} thrown` * Plugin Support [Dmytro](https://wordpress.org/support/users/dimasereda/) * (@dimasereda) * [3 weeks, 5 days ago](https://wordpress.org/support/topic/site-error-27/#post-18965931) * Hello. Thank you, for update. * Please update your Booking Calendar Pro version to the latest update, 10.14.1. You can do this directly from the plugin website: [https://wpbookingcalendar.com/](https://wpbookingcalendar.com/) * In the meantime, we will begin working on a compatibility fix to resolve this issue in our next update, which will allow you to use the new Free version alongside older Pro versions without errors. * Kind Regards. * Thread Starter [eshuisp](https://wordpress.org/support/users/eshuisp/) * (@eshuisp) * [3 weeks, 5 days ago](https://wordpress.org/support/topic/site-error-27/#post-18965953) * Thank you very much for the support. I got the new version and it’s working now. Good luck with the fix. Viewing 4 replies - 1 through 4 (of 4 total) You must be [logged in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fsite-error-27%2F%3Foutput_format%3Dmd&locale=en_US) to reply to this topic. * ![](https://ps.w.org/booking/assets/icon-256x256.gif?rev=3335907) * [Booking Calendar](https://wordpress.org/plugins/booking/) * [Frequently Asked Questions](https://wordpress.org/plugins/booking/#faq) * [Support Threads](https://wordpress.org/support/plugin/booking/) * [Active Topics](https://wordpress.org/support/plugin/booking/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/booking/unresolved/) * [Reviews](https://wordpress.org/support/plugin/booking/reviews/) * 5 replies * 2 participants * Last reply from: [eshuisp](https://wordpress.org/support/users/eshuisp/) * Last activity: [3 weeks, 5 days ago](https://wordpress.org/support/topic/site-error-27/#post-18965953) * Status: resolved