reinstalled all contribs with composer

need to run :
drush ev 'drupal_flush_all_caches();'
drush cr
and restart nginx and php-fpm before loading the website

web/modules/custom/edlp_studio/includes/composition.inc

@@ -0,0 +1,40 @@
+<?php
+
+use Drupal\Core\Render\Element;
+
+
+/**
+ * Prepares variables for Composition templates.
+ *
+ * Default template: composition.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - elements: An associative array containing the user information and any
+ *   - attributes: HTML attributes for the containing element.
+ */
+function template_preprocess_composition(array &$vars) {
+  // dpm($variables);
+  // Fetch Composition Entity Object.
+    /** @var \Drupal\edlp_studio\CompositionInterface $composition */
+  $composition = $vars['elements']['#composition'];
+
+  $vars['view_mode'] = $vars['elements']['#view_mode'];
+
+  // $vars['name'] = $composition->getName();
+  // unset($vars['elements']['name']);
+
+  // $variables['page'] = $variables['view_mode'] == 'full' && taxonomy_term_is_page($term);
+
+  $vars['url'] = $composition->url();
+
+  $vars['attributes']['cid'] = $composition->id();
+  $vars['attributes']['class'] = array('composition');
+
+  // Helpful $content variable for templates.
+  foreach (Element::children($vars['elements']) as $key) {
+    $vars['content'][$key] = $vars['elements'][$key];
+  }
+
+  // dpm($vars);
+}