>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3126754. --> Reported by: [nodecode](https://www.drupal.org/user/535804) >>> <p>This issue is present in both stable and dev. I've run update.php, cron, cleared all caches. Nothing works.</p> <p>Steps to reproduce:<br> 1. Install Calendar which installs Views Templates<br> 2. Visit /admin/structure/views/<br> 3. Click "Add view from template" which takes you to /admin/structure/views/template/list and results in a 500 error</p> <p>The error is as follows:</p> <blockquote><p>PHP Fatal error: Declaration of Drupal\calendar\Plugin\ViewsTemplateBuilder\ViewsFieldTemplate::buildConfigurationForm($form, Drupal\Core\Form\FormStateInterface $form_state) must be compatible with Drupal\views_templates\Plugin\ViewsBuilderPluginInterface::buildConfigurationForm(array $form, Drupal\Core\Form\FormStateInterface $form_state) in /mywebsite/modules/contrib/calendar/src/Plugin/ViewsTemplateBuilder/ViewsFieldTemplate.php on line 21</p></blockquote>