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I want to add a custom tab after "Edit" but can't figure out how to do so. I added a mymodule.links.task.yml file

entity.node.import_form:
  route_name: entity.node.import_form
  base_route: entity.node.canonical
  title: Import JSON from file

But I don't understand what to do next. The node form just errors out with:

Symfony\Component\Routing\Exception\RouteNotFoundException: Route "entity.node.import_form" does not exist. in Drupal\Core\Routing\RouteProvider->getRouteByName() (line 128 of /var/www/sites/datacenter.com/docroot/core/lib/Drupal/Core/Routing/RouteProvider.php).

  • Do you have defined entity.node.import_form in your $module.routing.yml file? – Daniel Wehner Apr 21 '15 at 14:15
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    I think I got confused looking at how Node adds an edit tab. I did not have a routing file, instead I looked at the node route provider class. – Kevin Apr 21 '15 at 15:19
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What you have done is to create a menu task on the route entity.node.canonical with the title of Import JSON from file which links to the route entity.node.import_form.

The error you are getting is because the route entity.node.import_form (the link of the task) doesn't exist. You have to either depend/enable the module that provides this route or create the route yourself.

  • This answer could be improved by providing information or a link on how to create the route yourself as mymodule.links.task.yml would seem to be his attempt to create the route himself. – Mark May 13 '16 at 20:17

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