'show_top_item' is not a supported key.
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3531800. -->
Reported by: [dbielke1986](https://www.drupal.org/user/3426903)
Related to !97
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>After Installing the version 2.0.1 I get the following error when I try to save the configuration of the book.</p>
<p>"'show_top_item' is not a supported key."</p>
<p><img src="https://www.drupal.org/files/issues/2025-06-23/Error.png" alt="Error"></p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<p>Install Book 2.0.0 and update to version 2.0.1</p>
issue