>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3358813. --> Reported by: [inst](https://www.drupal.org/user/780392) Related to !39 >>> <p>Hi,<br> I I would like to check out the content planner.<br> So I installed the module and dependencies via composer as described here <a href="https://www.youtube.com/watch?v=JAqb7cJgovY&amp;t=1180s">https://www.youtube.com/watch?v=JAqb7cJgovY&amp;t=1180s</a></p> <p>But at content [planner &gt; calendar &gt; settings] I get this error and can&acute;t see the calendar:</p> <p>Error: Call to undefined function Drupal\content_calendar\cal_days_in_month() in Drupal\content_calendar\DateTimeHelper::getDayCountInMonth() (line 68 of modules/contrib/content_planner/modules/content_calendar/src/DateTimeHelper.php).</p> <p>I followed workflow and made the settings at my content type.</p> <p>What did I miss?</p> <p>thanks!</p>