Title: fatal error when activating plugin
Last modified: November 14, 2025
---
# fatal error when activating plugin
* [martijnploos](https://wordpress.org/support/users/martijnploos/)
* (@martijnploos)
* [6 months, 3 weeks ago](https://wordpress.org/support/topic/fatal-error-when-activating-plugin-80/)
* Hello,
* I recently installed the latest WP and PHP/Apache and the plugin version: 10.30.2
* When activating the plugin I receive an error of a fatal error. The beneath error
is in the logging.
* Can you help me to fix this problem?
* [14-Nov-2025 20:41:29 UTC] PHP Notice: Function wp_register_script was called
incorrectly. Scripts and styles should not be registered or
enqueued until the wp_enqueue_scripts, admin_enqueue_scripts
, or login_enqueue_scripts hooks. This notice was triggered
by the salon-customServiceCategory handle. Please see Debugging](https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/”>Debugging)
in WordPress for more information. (This message was added in version 3.3.0.)
in /var/www/html/wp-includes/functions.php on line 6121 [14-Nov-2025 20:41:29
UTC] PHP Notice: Function wp_enqueue_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts
, admin_enqueue_scripts, or login_enqueue_scripts hooks. This notice was triggered by the salon-customServiceCategory
handle. Please see Debugging](https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/”>Debugging)
in WordPress for more information. (This message was added in version 3.3.0.)
in /var/www/html/wp-includes/functions.php on line 6121 [14-Nov-2025 20:41:29
UTC] PHP Notice: Function _load_textdomain_just_in_time was called incorrectly
. Translation loading for the salon-booking-system domain
was triggered too early. This is usually an indicator for some code in the plugin
or theme running too early. Translations should be loaded at the init action or later. Please see Debugging](https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/”>Debugging)
in WordPress for more information. (This message was added in version 6.7.0.)
in /var/www/html/wp-includes/functions.php on line 6121 [14-Nov-2025 20:41:30
UTC] PHP Deprecated: SLN_Enum_AvailabilityModeProvider::getService(): Implicitly
marking parameter $booking as nullable is deprecated, the explicit nullable type
must be used instead in /var/www/html/wp-content/plugins/salon-booking-system/
src/SLN/Enum/AvailabilityModeProvider.php on line 38 [14-Nov-2025 20:41:30 UTC]
PHP Deprecated: SLN_Repository_BookingRepository::getForAvailabilityBookings():
Implicitly marking parameter $currentBooking as nullable is deprecated, the explicit
nullable type must be used instead in /var/www/html/wp-content/plugins/salon-
booking-system/src/SLN/Repository/BookingRepository.php on line 111 [14-Nov-2025
20:41:30 UTC] PHP Deprecated: SLN_Repository_BookingRepository::getForAvailability():
Implicitly marking parameter $currentBooking as nullable is deprecated, the explicit
nullable type must be used instead in /var/www/html/wp-content/plugins/salon-
booking-system/src/SLN/Repository/BookingRepository.php on line 202 [14-Nov-2025
20:41:30 UTC] PHP Deprecated: SLN_Repository_BookingRepository::getForAvailabilityAllBookings():
Implicitly marking parameter $currentBooking as nullable is deprecated, the explicit
nullable type must be used instead in /var/www/html/wp-content/plugins/salon-
booking-system/src/SLN/Repository/BookingRepository.php on line 208 [14-Nov-2025
20:41:30 UTC] PHP Deprecated: SLN_Wrapper_Attendant::isNotAvailableOnDate():
Implicitly marking parameter $service as nullable is deprecated, the explicit
nullable type must be used instead in /var/www/html/wp-content/plugins/salon-
booking-system/src/SLN/Wrapper/Attendant.php on line 44 [14-Nov-2025 20:41:30
UTC] PHP Deprecated: SLN_Wrapper_AttendantInterface::isNotAvailableOnDate():
Implicitly marking parameter $service as nullable is deprecated, the explicit
nullable type must be used instead in /var/www/html/wp-content/plugins/salon-
booking-system/src/SLN/Wrapper/AttendantInterface.php on line 8 [14-Nov-2025
20:41:30 UTC] PHP Deprecated: GuzzleHttp\Promise\queue(): Implicitly marking
parameter $assign as nullable is deprecated, the explicit nullable type must
be used instead in /var/www/html/wp-content/plugins/salon-booking-system/src/
SLN/Third/google-api-php-client/vendor/guzzlehttp/promises/src/functions.php
on line 24 [14-Nov-2025 20:41:30 UTC] PHP Deprecated: GuzzleHttp\Promise\each():
Implicitly marking parameter $onFulfilled as nullable is deprecated, the explicit
nullable type must be used instead in /var/www/html/wp-content/plugins/salon-
booking-system/src/SLN/Third/google-api-php-client/vendor/guzzlehttp/promises/
src/functions.php on line 260 [14-Nov-2025 20:41:30 UTC] PHP Deprecated: GuzzleHttp\
Promise\each(): Implicitly marking parameter $onRejected as nullable is deprecated,
the explicit nullable type must be used instead in /var/www/html/wp-content/plugins/
salon-booking-system/src/SLN/Third/google-api-php-client/vendor/guzzlehttp/promises/
src/functions.php on line 260 [14-Nov-2025 20:41:30 UTC] PHP Deprecated: GuzzleHttp\
Promise\each_limit(): Implicitly marking parameter $onFulfilled as nullable is
deprecated, the explicit nullable type must be used instead in /var/www/html/
wp-content/plugins/salon-booking-system/src/SLN/Third/google-api-php-client/vendor/
guzzlehttp/promises/src/functions.php on line 285 [14-Nov-2025 20:41:30 UTC]
PHP Deprecated: GuzzleHttp\Promise\each_limit(): Implicitly marking parameter
$onRejected as nullable is deprecated, the explicit nullable type must be used
instead in /var/www/html/wp-content/plugins/salon-booking-system/src/SLN/Third/
google-api-php-client/vendor/guzzlehttp/promises/src/functions.php on line 285[
14-Nov-2025 20:41:30 UTC] PHP Deprecated: GuzzleHttp\Promise\each_limit_all():
Implicitly marking parameter $onFulfilled as nullable is deprecated, the explicit
nullable type must be used instead in /var/www/html/wp-content/plugins/salon-
booking-system/src/SLN/Third/google-api-php-client/vendor/guzzlehttp/promises/
src/functions.php on line 307 [14-Nov-2025 20:41:30 UTC] PHP Notice: Function
wp_register_script was called incorrectly. Scripts and styles
should not be registered or enqueued until the wp_enqueue_scripts, admin_enqueue_scripts, or login_enqueue_scripts
hooks. This notice was triggered by the salon-customServiceCategory handle. Please see Debugging](https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/”>Debugging)
in WordPress for more information. (This message was added in version 3.3.0.)
in /var/www/html/wp-includes/functions.php on line 6121 [14-Nov-2025 20:41:30
UTC] PHP Notice: Function wp_enqueue_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts
, admin_enqueue_scripts, or login_enqueue_scripts hooks. This notice was triggered by the salon-customServiceCategory
handle. Please see Debugging](https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/”>Debugging)
in WordPress for more information. (This message was added in version 3.3.0.)
in /var/www/html/wp-includes/functions.php on line 6121 [14-Nov-2025 20:41:30
UTC] PHP Notice: Function _load_textdomain_just_in_time was called incorrectly
. Translation loading for the salon-booking-system domain
was triggered too early. This is usually an indicator for some code in the plugin
or theme running too early. Translations should be loaded at the init action or later. Please see Debugging](https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/”>Debugging)
in WordPress for more information. (This message was added in version 6.7.0.)
in /var/www/html/wp-includes/functions.php on line 6121 [14-Nov-2025 20:41:31
UTC] PHP Notice: Function wp_register_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts, admin_enqueue_scripts, or login_enqueue_scripts
hooks. This notice was triggered by the salon-customServiceCategory
handle. Please see Debugging](https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/”>Debugging)
in WordPress for more information. (This message was added in version 3.3.0.)
in /var/www/html/wp-includes/functions.php on line 6121 [14-Nov-2025 20:41:31
UTC] PHP Notice: Function wp_enqueue_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts
, admin_enqueue_scripts, or login_enqueue_scripts hooks. This notice was triggered by the salon-customServiceCategory
handle. Please see Debugging](https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/”>Debugging)
in WordPress for more information. (This message was added in version 3.3.0.)
in /var/www/html/wp-includes/functions.php on line 6121 [14-Nov-2025 20:41:31
UTC] PHP Notice: Function _load_textdomain_just_in_time was called incorrectly
. Translation loading for the salon-booking-system domain
was triggered too early. This is usually an indicator for some code in the plugin
or theme running too early. Translations should be loaded at the init action or later. Please see Debugging](https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/”>Debugging)
in WordPress for more information. (This message was added in version 6.7.0.)
in /var/www/html/wp-includes/functions.php on line 6121
* The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-when-activating-plugin-80%2F%3Foutput_format%3Dmd&locale=en_US)
to see the link]_
The topic ‘fatal error when activating plugin’ is closed to new replies.
* 
* [Salon Booking System - Free Version](https://wordpress.org/plugins/salon-booking-system/)
* [Frequently Asked Questions](https://wordpress.org/plugins/salon-booking-system/#faq)
* [Support Threads](https://wordpress.org/support/plugin/salon-booking-system/)
* [Active Topics](https://wordpress.org/support/plugin/salon-booking-system/active/)
* [Unresolved Topics](https://wordpress.org/support/plugin/salon-booking-system/unresolved/)
* [Reviews](https://wordpress.org/support/plugin/salon-booking-system/reviews/)
* 0 replies
* 1 participant
* Last reply from: [martijnploos](https://wordpress.org/support/users/martijnploos/)
* Last activity: [6 months, 3 weeks ago](https://wordpress.org/support/topic/fatal-error-when-activating-plugin-80/)
* Status: not resolved