I'm running Drupal 9.5.10 with PHP 8.1 and the 2.1.1 version of this module. I created a view, added my date field to it, and selected the "Calendar" month format. Nothing happened, except this error in the logs:
Drupal\Component\Plugin\Exception\PluginException: Plugin (calendar_month) instance class "Drupal\calendar_view\Plugin\views\style\CalendarViewMonth" does not exist. in Drupal\Component\Plugin\Factory\DefaultFactory::getPluginClass() (line 97 of /var/www/html/docroot/core/lib/Drupal/Component/Plugin/Factory/DefaultFactory.php).
If I try a week-based calendar display I get this instead:
Drupal\Component\Plugin\Exception\PluginException: Plugin (calendar_week) instance class "Drupal\calendar_view\Plugin\views\style\CalendarViewWeek" does not exist. in Drupal\Component\Plugin\Factory\DefaultFactory::getPluginClass() (line 97 of /var/www/html/docroot/core/lib/Drupal/Component/Plugin/Factory/DefaultFactory.php).
The calendar_month and calendar_week plugins weren't getting registered with Drupal.
Rebuilding Drupal's cache / running 'drush cr' fixed it. While it may seem obvious to run 'drush cr' after installing the module, it isn't part of the Usage instructions on the project home page, which I was following verbatim. Perhaps that should be amended to mention rebuilding caches.
Closed: works as designed
2.1
Documentation
There is usually no need to force the registration of Views plugins after installation of a module in Drupal.
Clearing caches is the only fix I know of.
I guess something wrong happened during the installation process somewhere else in your codebase 🤷♂️.
I updated the documentation page → accordingly anyway.
Thank you for reporting this issue.