I have the Webform module version 8.x-5.0-beta9, and when I try to uninstall the module Drush asks me to uninstall the webform_demo_application_evaluation module, first. When I try
drush pm-uninstall webform_demo_application_evaluation, it throws an error.

PHP Fatal error: Call to a member function getColumns() on boolean in /var/www-drupal/core/lib/Drupal/Core/Entity/Query/Sql/Tables.php on line 227
Drush command terminated abnormally due to an unrecoverable error.
Error: Call to a member function getColumns() on boolean in /var/www-drupal/core/lib/Drupal/Core/Entity/Query/Sql/Tables.php, line 227

How do I resolve this issue? Do I need to install the development snapshot?

1 Answer 1


You should be able to manually delete the demo forms, blocks, and nodes and then uninstall the demo module.

Please create a ticket in the Webform issue queue.

  • I manually deleted webform_demo and webform_node inside modules folder and then i could uninstall the webform using drush . Thanks .
    – KTM
    Commented Mar 30, 2017 at 7:35

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