Error message
Warning: file_get_contents(https://www1.muelheim-ruhr.de/event-export/0): Failed to open stream: "Drupal\remote_stream_wrapper\StreamWrapper\HttpStreamWrapper::stream_open" call failed in Drupal\kultur_event_block\Plugin\Block\EventBlock->getEvent() (line 19 of modules/custom/kultur_event_block/src/Plugin/Block/EventBlock.php).
Drupal\kultur_event_block\Plugin\Block\EventBlock->getEvent() (Line: 35)
Drupal\kultur_event_block\Plugin\Block\EventBlock->build() (Line: 171)
Drupal\block\BlockViewBuilder::preRender()
call_user_func_array() (Line: 113)
Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 870)
Drupal\Core\Render\Renderer->doCallback() (Line: 432)
Drupal\Core\Render\Renderer->doRender() (Line: 248)
Drupal\Core\Render\Renderer->render() (Line: 165)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 638)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 166)
Drupal\Core\Render\Renderer->renderInIsolation() (Line: 191)
Drupal\Core\Render\Renderer->doRenderPlaceholder() (Line: 723)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}()
Fiber->start() (Line: 731)
Drupal\Core\Render\Renderer->replacePlaceholders() (Line: 608)
Drupal\Core\Render\Renderer->doRender() (Line: 248)
Drupal\Core\Render\Renderer->render() (Line: 153)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 638)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 154)
Drupal\Core\Render\Renderer->renderRoot() (Line: 288)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->renderPlaceholders() (Line: 74)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments() (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond()
call_user_func() (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 214)
Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 202)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 191)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 128)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 82)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)
Drupal\Core\DrupalKernel->handle() (Line: 19)