PHP error on installing Decoupled Layout Builder API
>>> [!note] Migrated issue
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<!-- Migrated from issue #3501109. -->
Reported by: [akhil babu](https://www.drupal.org/user/3632866)
Related to !1
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Getting the below error when installing the Decoupled Layout Builder API module</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br>PHP Fatal error</span><span style="color: #007700">: </span><span style="color: #0000BB">Type of Drupal</span><span style="color: #007700">\</span><span style="color: #0000BB">importmaps</span><span style="color: #007700">\</span><span style="color: #0000BB">ImportMapsManager</span><span style="color: #007700">::</span><span style="color: #0000BB">$moduleExtensionList must be </span><span style="color: #007700">?</span><span style="color: #0000BB">Drupal</span><span style="color: #007700">\</span><span style="color: #0000BB">Core</span><span style="color: #007700">\</span><span style="color: #0000BB">Extension</span><span style="color: #007700">\</span><span style="color: #0000BB">ModuleExtensionList </span><span style="color: #007700">(as </span><span style="color: #0000BB">in </span><span style="color: #007700">class </span><span style="color: #0000BB">Drupal</span><span style="color: #007700">\</span><span style="color: #0000BB">Core</span><span style="color: #007700">\</span><span style="color: #0000BB">Plugin</span><span style="color: #007700">\</span><span style="color: #0000BB">DefaultPluginManager</span><span style="color: #007700">) </span><span style="color: #0000BB">in </span><span style="color: #007700">/var/</span><span style="color: #0000BB">www</span><span style="color: #007700">/</span><span style="color: #0000BB">html</span><span style="color: #007700">/</span><span style="color: #0000BB">docroot</span><span style="color: #007700">/</span><span style="color: #0000BB">modules</span><span style="color: #007700">/</span><span style="color: #0000BB">contrib</span><span style="color: #007700">/</span><span style="color: #0000BB">importmaps</span><span style="color: #007700">/</span><span style="color: #0000BB">src</span><span style="color: #007700">/</span><span style="color: #0000BB">ImportMapsManager</span><span style="color: #007700">.</span><span style="color: #0000BB">php on line 18<br>?></span></span></pre></div>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<pre>ddev composer require 'drupal/decoupled_lb_api:^1.0@alpha'<br>ddev drush en decoupled_lb_api or try to install the module from UI </pre><h3 id="summary-proposed-resolution">Proposed resolution</h3>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
issue
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Project: project/importmaps
Instance: https://git.drupalcode.org
Repository: https://git.drupalcode.org/project/importmaps
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