Error en carga de media en el apartado de items

Quiero cargar un archivo en un nuevo item pero al seleccionarlo y agregarlo, me bota este error
(esto pasa sí quiero subir una imagen, documento, video etc., al igual que si elijo la opción de enlazar un url de youtube o una iiif image).
2022-06-13T17:35:59+00:00 ERR (3): Laminas\ServiceManager\Exception\ServiceNotFoundException: Unable to resolve service “Omeka\File\Thumbnailer\GD” to a factory; are you certain you provided it during configuration? in C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-servicemanager\src\ServiceManager.php:688
Stack trace:
#0 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-servicemanager\src\ServiceManager.php(764): Laminas\ServiceManager\ServiceManager->getFactory(‘Omeka\File\Thum…’)
#1 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-servicemanager\src\ServiceManager.php(228): Laminas\ServiceManager\ServiceManager->doCreate(‘Omeka\File\Thum…’, NULL)
#2 C:\xampp\XAMPP\htdocs\omeka\application\src\File\ThumbnailManager.php(36): Laminas\ServiceManager\ServiceManager->build(‘Omeka\File\Thum…’)
#3 C:\xampp\XAMPP\htdocs\omeka\application\src\File\TempFile.php(258): Omeka\File\ThumbnailManager->buildThumbnailer()
#4 C:\xampp\XAMPP\htdocs\omeka\application\src\File\TempFile.php(439): Omeka\File\TempFile->storeThumbnails()
#5 C:\xampp\XAMPP\htdocs\omeka\application\src\Media\Ingester\Upload.php(62): Omeka\File\TempFile->mediaIngestFile(Object(Omeka\Entity\Media), Object(Omeka\Api\Request), Object(Omeka\Stdlib\ErrorStore))
#6 C:\xampp\XAMPP\htdocs\omeka\application\src\Api\Adapter\MediaAdapter.php(169): Omeka\Media\Ingester\Upload->ingest(Object(Omeka\Entity\Media), Object(Omeka\Api\Request), Object(Omeka\Stdlib\ErrorStore))
#7 C:\xampp\XAMPP\htdocs\omeka\application\src\Api\Adapter\AbstractEntityAdapter.php(630): Omeka\Api\Adapter\MediaAdapter->hydrate(Object(Omeka\Api\Request), Object(Omeka\Entity\Media), Object(Omeka\Stdlib\ErrorStore))
#8 C:\xampp\XAMPP\htdocs\omeka\application\src\Api\Adapter\ItemAdapter.php(257): Omeka\Api\Adapter\AbstractEntityAdapter->hydrateEntity(Object(Omeka\Api\Request), Object(Omeka\Entity\Media), Object(Omeka\Stdlib\ErrorStore))
#9 C:\xampp\XAMPP\htdocs\omeka\application\src\Api\Adapter\AbstractEntityAdapter.php(630): Omeka\Api\Adapter\ItemAdapter->hydrate(Object(Omeka\Api\Request), Object(Omeka\Entity\Item), Object(Omeka\Stdlib\ErrorStore))
#10 C:\xampp\XAMPP\htdocs\omeka\application\src\Api\Adapter\AbstractEntityAdapter.php(440): Omeka\Api\Adapter\AbstractEntityAdapter->hydrateEntity(Object(Omeka\Api\Request), Object(Omeka\Entity\Item), Object(Omeka\Stdlib\ErrorStore))
#11 C:\xampp\XAMPP\htdocs\omeka\application\src\Api\Manager.php(233): Omeka\Api\Adapter\AbstractEntityAdapter->update(Object(Omeka\Api\Request))
#12 C:\xampp\XAMPP\htdocs\omeka\application\src\Api\Manager.php(136): Omeka\Api\Manager->execute(Object(Omeka\Api\Request))
#13 C:\xampp\XAMPP\htdocs\omeka\application\src\Mvc\Controller\Plugin\Api.php(152): Omeka\Api\Manager->update(‘items’, ‘4’, Array, Array, Array)
#14 C:\xampp\XAMPP\htdocs\omeka\application\src\Controller\Admin\ItemController.php(245): Omeka\Mvc\Controller\Plugin\Api->update(‘items’, ‘4’, Array, Array)
#15 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-mvc\src\Controller\AbstractActionController.php(77): Omeka\Controller\Admin\ItemController->editAction()
#16 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-eventmanager\src\EventManager.php(321): Laminas\Mvc\Controller\AbstractActionController->onDispatch(Object(Laminas\Mvc\MvcEvent))
#17 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-eventmanager\src\EventManager.php(178): Laminas\EventManager\EventManager->triggerListeners(Object(Laminas\Mvc\MvcEvent), Object(Closure))
#18 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-mvc\src\Controller\AbstractController.php(103): Laminas\EventManager\EventManager->triggerEventUntil(Object(Closure), Object(Laminas\Mvc\MvcEvent))
#19 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-mvc\src\DispatchListener.php(139): Laminas\Mvc\Controller\AbstractController->dispatch(Object(Laminas\Http\PhpEnvironment\Request), Object(Laminas\Http\PhpEnvironment\Response))
#20 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-eventmanager\src\EventManager.php(321): Laminas\Mvc\DispatchListener->onDispatch(Object(Laminas\Mvc\MvcEvent))
#21 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-eventmanager\src\EventManager.php(178): Laminas\EventManager\EventManager->triggerListeners(Object(Laminas\Mvc\MvcEvent), Object(Closure))
#22 C:\xampp\XAMPP\htdocs\omeka\vendor\laminas\laminas-mvc\src\Application.php(331): Laminas\EventManager\EventManager->triggerEventUntil(Object(Closure), Object(Laminas\Mvc\MvcEvent))
#23 C:\xampp\XAMPP\htdocs\omeka\index.php(21): Laminas\Mvc\Application->run()
#24 {main}

I’ll respond in English, my apologies if that’s an issue.

From the error message, it looks like you may just have written Omeka\File\Thumbnailer\GD in your config/local.config.php file, when it should be Omeka\File\Thumbnailer\Gd (note the lowercase “d” at the end) instead.