"Suddenly" I get a fatal exception when trying to configure my pathalias settings.

Drupal\Component\Plugin\Exception\PluginNotFoundException: The "canonical_entities:node" plugin does not exist. in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 52 of /var/www/verifyhosting/core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php).

is thrown when visiting /admin/config/search/path/patterns from the backend.

I'm pretty sure it once worked. No exakt idea what change since then. I only saw that a newly created article didn't get a configured urlalias, so I wanted to look and failed.

Other modules installed like Token, Metatag, Captcha, Simple XML sitemap

Comments

kkretsch created an issue. See original summary.

kkretsch’s picture

Some more version infos:

Drupal core 8.1.3
Includes: Bartik, Block, Breakpoint, CKEditor, Classy, Color, Comment, Configuration Manager, Contact, Contextual Links, Custom Block, Custom Menu Links, Database Logging, Datetime, Field, Field UI, File, Filter, Help, History, Image, Internal Dynamic Page Cache, Internal Page Cache, Link, Menu UI, Node, Options, Path, Quick Edit, RDF, Search, Seven, Shortcut, Stable, Standard, Syslog, System, Taxonomy, Text, Text Editor, Toolbar, Update Manager, User, Views, Views UI

Modules
CAPTCHA 8.x-1.0-alpha0
Includes: CAPTCHA, Image CAPTCHA

Chaos tool suite (ctools) 8.x-3.0-alpha26
Includes: Chaos tools

Memcache Storage 8.x-1.0-beta2
Includes: Memcache Storage

Metatag 8.x-1.0-beta9
Includes: Metatag, Metatag: Google Plus, Metatag: Open Graph, Metatag: Twitter Cards, Metatag: Verification

Pathauto 8.x-1.0-alpha3
Includes: Pathauto

Piwik Web Analytics 8.x-1.0
Includes: Piwik Web Analytics

reCAPTCHA 8.x-2.0
Includes: reCAPTCHA

Simple XML sitemap 8.x-2.5
Includes: Simple XML Sitemap

Token 8.x-1.0-alpha2
Includes: Token

Themes
AdaptiveTheme 8.x-1.0-rc1
Includes: AT Core, AT Theme Generator

Berdir’s picture

Status: Active » Postponed (maintainer needs more info)

I've seen a few reports like this but it works fine for me and thousands of others, not sure what is wrong in your case. I assume you cleared caches?

Do you have any patches enabled?

If you can give me access to your installation, contact me through the contact form, I don't see how I can figure this out otherwise.

mpp’s picture

I also ran into some "plugin does not exist" errors.
Probably not related to this exact issue but in my case it was because of the FieldFormatter annotation for a custom field formatter that was using a quickedit editor plugin that didn't exist:

 * @FieldFormatter(
 *   id = "responsive_image_with_copyright",
 *   label = @Translation("Responsive Image with Copyright"),
 *   field_types = {
 *     "image_with_copyright"
 *   },
 *   quickedit = {
 *     "editor" = "not_existing"
 *   }
 * )