block definition not loaded

Hello,

I'm on drupal 8.9.12 (with php 7.4) and the version 8.2.2 of this module

When I create a instance of block "Subscribe Block"

I get this error

Notice: Trying to access array offset on value of type null in Drupal\Core\Block\BlockBase->baseConfigurationDefaults() (line 90 of core/lib/Drupal/Core/Block/BlockPluginTrait.php).
Drupal\Core\Block\BlockBase->baseConfigurationDefaults() (Line: 74)
Drupal\Core\Block\BlockBase->setConfiguration(Array) (Line: 85)
Drupal\Core\Plugin\DefaultSingleLazyPluginCollection->setConfiguration(Array) (Line: 99)
Drupal\Core\Plugin\DefaultSingleLazyPluginCollection->addInstanceId('campaignmonitor_subscribe_block', Array) (Line: 55)
Drupal\Core\Plugin\DefaultSingleLazyPluginCollection->__construct(Object, 'campaignmonitor_subscribe_block', Array) (Line: 34)
Drupal\block\BlockPluginCollection->__construct(Object, 'campaignmonitor_subscribe_block', Array, NULL) (Line: 156)
Drupal\block\Entity\Block->getPluginCollection() (Line: 145)
Drupal\block\Entity\Block->getPlugin() (Line: 141)
Drupal\block\BlockForm->form(Array, Object) (Line: 149)
Drupal\Core\Entity\EntityForm->buildForm(Array, Object)
call_user_func_array(Array, Array) (Line: 532)
Drupal\Core\Form\FormBuilder->retrieveForm('block_form', Object) (Line: 278)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 61)
Drupal\Core\Entity\EntityFormBuilder->getForm(Object) (Line: 27)
Drupal\block\Controller\BlockAddController->blockAddConfigureForm('campaignmonitor_subscribe_block', 'mytheme')
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 573)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 151)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 708)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Here The line where find the error

protected function baseConfigurationDefaults() {
    return [
      'id' => $this->getPluginId(),
      'label' => '',
      'provider' => $this->pluginDefinition['provider'], <- the error
      'label_display' => BlockPluginInterface::BLOCK_LABEL_VISIBLE,
    ];
  }

the property $this->pluginDefinition is empty, I don't understand why

I reinstalled the module with composer.