I recently updated my project from Drupal 8.3.7 to Drupal 8.4.2 and afterwards I ran into errors when trying to delete Group content.

When I try to remove a member from a Group or delete content created in a Group I get the error:
Symfony\Component\Routing\Exception\MissingMandatoryParametersException: Some mandatory parameters are missing ("plugin_id") to generate a URL for route "entity.group_content.add_form". in Drupal\Core\Routing\UrlGenerator->doGenerate() (line 182 of /var/www/html/drupal/docroot/core/lib/Drupal/Core/Routing/UrlGenerator.php).

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lee.cocklin created an issue. See original summary.

dravenk’s picture