Deprecated: assert(): Calling assert() with a string argument is deprecated in /www/htdocs/w018bfc7/drupal/core/lib/Drupal/Core/Plugin/DefaultPluginManager.php on line 151

Deprecated: assert(): Calling assert() with a string argument is deprecated in /www/htdocs/w018bfc7/drupal/core/lib/Drupal/Core/Cache/Cache.php on line 32
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RuntimeException: Failed to start the session because headers have already been sent by "/www/htdocs/w018bfc7/drupal/core/lib/Drupal/Core/Plugin/DefaultPluginManager.php" at line 151. in Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() (line 140 of vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php).

Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() (Line: 163)
Drupal\Core\Session\SessionManager->startNow() (Line: 194)
Drupal\Core\Session\SessionManager->save() (Line: 181)
Symfony\Component\HttpFoundation\Session\Session->save() (Line: 60)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 207)
Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 121)
Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 75)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)