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Recently I updated my drupal site from 8.6.14 to 8.7.6.

A previously-working Entity Reference View display that is connected to a form Autocomplete field stopped working.
The spinning circle keeps spinning and does not match user input to an entity.
(The ER View display concatenates a user email address and his company name for easier user selection : ie "[email protected] - Smith Plumbing, Inc." )

Error in log is:

Error: Class 'Drupal\views\Plugin\EntityReferenceSelection\Xss' not found in Drupal\views\Plugin\EntityReferenceSelection\ViewsSelection->stripAdminAndAnchorTagsFromResults() (line 272 of /Applications/MAMP/htdocs/chapter6/core/modules/views/src/Plugin/EntityReferenceSelection/ViewsSelection.php)

I added use Drupal\Components\Utility\XSS to ViewSelection.php and now the error is

Recoverable fatal error: Object of class Drupal\views\ViewExecutable could not be converted to string in Drupal\Core\Entity\EntityAutocompleteMatcher->getMatches() (line 69 of /Applications/MAMP/htdocs/chapter6/core/lib/Drupal/Core/Entity/EntityAutocompleteMatcher.php)

Has anyone else experienced this in latest drupal 8?

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    You've installed a patch from this issue drupal.org/project/drupal/issues/2174633, which obviously no longer applies.
    – 4uk4
    Aug 22, 2019 at 21:21
  • Thank you, yes. I had applied patch drupal/issues/2174633#238 last February. Had to remove that and apply drupal/issues/2174633#323 to drupal 8.7.6 to get it working. All is well.
    – MEI
    Aug 23, 2019 at 19:46

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