I upgraded from Drupal 8.9.20 to Drupal 9.59. All modules seem compatible (upgrade manager). The site is up and running, but if I try to add new content via node/add/article, this error appears.
TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, class Drupal\node\Entity\Node does not have a method "getCurrentUserId" in call_user_func() (line 400 of /html/core/lib/Drupal/Core/Field/FieldConfigBase.php)
#0 /html/core/lib/Drupal/Core/Field/FieldConfigBase.php(400): call_user_func('...', Object(Drupal\node\Entity\Node), Object(Drupal\Core\Field\Entity\BaseFieldOverride))
#1 /html/core/lib/Drupal/Core/Field/FieldItemList.php(169): Drupal\Core\Field\FieldConfigBase->getDefaultValue(Object(Drupal\node\Entity\Node))
#2 /html/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php(271): Drupal\Core\Field\FieldItemList->applyDefaultValue()
#3 /html/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php(129): Drupal\Core\Entity\ContentEntityStorageBase->initFieldValues(Object(Drupal\node\Entity\Node), Array)
#4 /html/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php(94): Drupal\Core\Entity\ContentEntityStorageBase->doCreate(Array)
#5 /html/core/lib/Drupal/Core/Entity/EntityForm.php(370): Drupal\Core\Entity\ContentEntityStorageBase->create(Array)
#6 /html/core/lib/Drupal/Core/Entity/HtmlEntityFormController.php(73): Drupal\Core\Entity\EntityForm->getEntityFromRouteMatch(Object(Drupal\Core\Routing\RouteMatch), '...')
#7 /html/core/lib/Drupal/Core/Controller/FormController.php(58): Drupal\Core\Entity\HtmlEntityFormController->getFormObject(Object(Drupal\Core\Routing\RouteMatch), '...')
#8 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch))
#9 /html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array)
#10 /html/core/lib/Drupal/Core/Render/Renderer.php(580): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}()
#11 /html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure))
#12 /html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array)
#13 /html/vendor/symfony/http-kernel/HttpKernel.php(169): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}()
#14 /html/vendor/symfony/http-kernel/HttpKernel.php(81): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#15 /html/core/lib/Drupal/Core/StackMiddleware/Session.php(58): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#16 /html/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#17 /html/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#18 /html/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#19 /html/core/modules/ban/src/BanMiddleware.php(50): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#20 /html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\ban\BanMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#21 /html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#22 /html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#23 /html/core/lib/Drupal/Core/DrupalKernel.php(718): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#24 /html/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#25 {main}
Do you know how to fix that?