Error bei der Installaion von drupal

Drupal-Version: 8.6.3 Akutule PHP Version die Verwendet wird

Warning: error_log() has been disabled for security reasons in _drupal_log_error() (line 174 of core/includes/errors.inc).

_drupal_log_error(Array, 1) (Line: 602)
_drupal_exception_handler(Object)

The website encountered an unexpected error. Please try again later.
Drupal\Component\Plugin\Exception\PluginNotFoundException: The "Count" plugin does not exist. in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 52 of core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php).

Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition(Array, 'Count', 1) (Line: 25)
Drupal\Core\Plugin\DefaultPluginManager->getDefinition('Count') (Line: 16)
Drupal\Core\Plugin\Factory\ContainerFactory->createInstance('Count', Array) (Line: 83)
Drupal\Component\Plugin\PluginManagerBase->createInstance('Count', Array) (Line: 78)
Drupal\Core\Validation\ConstraintManager->create('Count', Array) (Line: 272)
Drupal\Core\Field\FieldItemList->getConstraints() (Line: 54)
Drupal\Core\TypedData\Validation\TypedDataMetadata->getConstraints() (Line: 47)
Drupal\Core\TypedData\Validation\TypedDataMetadata->findConstraints('Default') (Line: 138)
Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validateNode(Object, NULL, 1) (Line: 99)
Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validate(Object, NULL, NULL) (Line: 90)
Drupal\Core\TypedData\Validation\RecursiveValidator->validate(Object) (Line: 131)
Drupal\Core\TypedData\TypedData->validate() (Line: 292)
user_validate_name('singles-mit-handicap') (Line: 262)
Drupal\Core\Installer\Form\SiteConfigureForm->validateForm(Array, Object)
call_user_func_array(Array, Array) (Line: 82)
Drupal\Core\Form\FormValidator->executeValidateHandlers(Array, Object) (Line: 275)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object, 'install_configure_form') (Line: 118)
Drupal\Core\Form\FormValidator->validateForm('install_configure_form', Array, Object) (Line: 575)
Drupal\Core\Form\FormBuilder->processForm('install_configure_form', Array, Object) (Line: 318)
Drupal\Core\Form\FormBuilder->buildForm('install_configure_form', Object) (Line: 961)
install_get_form('Drupal\Core\Installer\Form\SiteConfigureForm', Array) (Line: 631)
install_run_task(Array, Array) (Line: 584)
install_run_tasks(Array, NULL) (Line: 125)
install_drupal(Object) (Line: 44)