After update the panels module to 8.x-4.2 I got the following error when ever I submit any form in the site.
Drupal\Component\Plugin\Exception\PluginNotFoundException: The “twocol” plugin does not exist. in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 52 of /var/www/test_site/core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php).
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