Error: Call to a member function getBody() on null in Drupal\gutenberg_cloud\Form\BlockManagerForm->buildForm()

Clicking on the Gutenberg Cloud Configuration via /admin/config/gutenberg-cloud crashes the site with the famous "The website encountered an unexpected error. Please try again later." white screen. The log for the error gives the following
Error: Call to a member function getBody() on null in Drupal\gutenberg_cloud\Form\BlockManagerForm->buildForm() (line 45 of C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\modules\contrib\gutenberg\modules\gutenberg_cloud\src\Form\BlockManagerForm.php) #0 [internal function]: Drupal\gutenberg_cloud\Form\BlockManagerForm->buildForm(Array, Object(Drupal\Core\Form\FormState)) #1 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\Form\FormBuilder.php(518): call_user_func_array(Array, Array) #2 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\Form\FormBuilder.php(275): Drupal\Core\Form\FormBuilder->retrieveForm('gutenberg_cloud...', Object(Drupal\Core\Form\FormState)) #3 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\Controller\FormController.php(93): Drupal\Core\Form\FormBuilder->buildForm('gutenberg_cloud...', Object(Drupal\Core\Form\FormState)) #4 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch)) #5 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #6 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\Render\Renderer.php(582): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #7 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #8 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #9 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\vendor\symfony\http-kernel\HttpKernel.php(151): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #10 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\vendor\symfony\http-kernel\HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #11 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\StackMiddleware\Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #12 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\StackMiddleware\KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #13 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\modules\page_cache\src\StackMiddleware\PageCache.php(99): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #14 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\modules\page_cache\src\StackMiddleware\PageCache.php(78): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #15 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\StackMiddleware\ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #16 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\modules\contrib\devel\webprofiler\src\StackMiddleware\WebprofilerMiddleware.php(38): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #17 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\StackMiddleware\NegotiationMiddleware.php(52): Drupal\webprofiler\StackMiddleware\WebprofilerMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #18 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\vendor\stack\builder\src\Stack\StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #19 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\core\lib\Drupal\Core\DrupalKernel.php(693): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #20 C:\Users\lamontagne\Documents\Web-Projects\wamp64\www\drupal-training\index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #21 {main}.