Site won't load after deleting an external entity

Hi

I deleted a external entitiy which has led to a white screen with the following error mesage "The website encountered an unexpected error. Try again later."

Looking at the logs I get:

#12 /home/michae20/libraryofcalbria.com/index.php(22): Drupal\Core\DrupalKernel->terminate()
#11 /home/michae20/libraryofcalbria.com/core/lib/Drupal/Core/DrupalKernel.php(715): Drupal\Core\StackMiddleware\StackedHttpKernel->terminate()
#10 /home/michae20/libraryofcalbria.com/core/lib/Drupal/Core/StackMiddleware/StackedHttpKernel.php(66): Symfony\Component\HttpKernel\HttpKernel->terminate()
#9 /home/michae20/libraryofcalbria.com/vendor/symfony/http-kernel/HttpKernel.php(115): Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch()
#8 /home/michae20/libraryofcalbria.com/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php(111): call_user_func()
#6 /home/michae20/libraryofcalbria.com/core/modules/automated_cron/src/EventSubscriber/AutomatedCron.php(65): Drupal\Core\ProxyClass\Cron->run()
#5 /home/michae20/libraryofcalbria.com/core/lib/Drupal/Core/ProxyClass/Cron.php(75): Drupal\Core\Cron->run()
#4 /home/michae20/libraryofcalbria.com/core/lib/Drupal/Core/Cron.php(159): Drupal\Core\Cron->invokeCronHandlers()
#3 /home/michae20/libraryofcalbria.com/core/lib/Drupal/Core/Cron.php(318): Drupal\Core\Extension\ModuleHandler->invokeAllWith()
#2 /home/michae20/libraryofcalbria.com/core/lib/Drupal/Core/Extension/ModuleHandler.php(395): Drupal\Core\Cron->Drupal\Core\{closure}()
#1 /home/michae20/libraryofcalbria.com/core/lib/Drupal/Core/Cron.php(335): xnttmanager_cron()

Error: Call to a member function getFieldMapper() on null in /home/michae20/libraryofcalbria.com/modules/contrib/xnttmanager/src/Entity/XnttSync.php on line 150 #0 /home/michae20/libraryofcalbria.com/modules/contrib/xnttmanager/xnttmanager.module(133): Drupal\xnttmanager\Entity\XnttSync->synchronize()
[Wed Jul 24 08:36:45.627701 2024] [lsapi:warn] [host libraryofcalbria.com] Backend log: Uncaught PHP Exception Drupal\\Component\\Plugin\\Exception\\PluginNotFoundException: "The "skill_descriptor" entity type does not exist." at /home/michae20/libraryofcalbria.com/core/lib/Drupal/Core/Entity/EntityTypeManager.php line 142\n

I am unable to locate a solution and am hoping someone can give me a pointer?

Thankyou

Michael