some change that was done on live :(

modules/opencase_cases/opencase_cases.module

@@ -66,10 +66,9 @@ function opencase_cases_entity_base_field_info($entity_type) {
   return $fields;
 }
 
-/**
- * When creating an activity, it sets the case id from the URL.
- */
-function opencase_cases_default_activity_case_value() {
+/* When creating an activity, it sets the case id from the URL.
+/*/
+public static function opencase_cases_default_activity_case_value() {
  return array(\Drupal::request()->query->get('case_id'));
 }
 
@@ -90,11 +89,11 @@ function opencase_cases_form_alter(&$form, &$form_state, $form_id) {
  
 function _opencase_cases_redirect_to_home($form, &$form_state) {
   $form_state->setRedirect('<front>'); 
-}
+ 
 function _opencase_cases_delete_activity_redirect($form, &$form_state) {
   $case_id = $form_state->getFormObject()->getEntity()->oc_case->target_id;
   $form_state->setRedirect('entity.oc_case.canonical', ['oc_case' => $case_id]);
-}
+ 
 /**
  * Implements hook_theme_suggestions_HOOK().
  */

modules/opencase_no_cases/opencase_no_cases.module

@@ -26,7 +26,6 @@ function opencase_no_cases_help($route_name, RouteMatchInterface $route_match) {
 
 function opencase_no_cases_entity_base_field_info($entity_type) {
   if ($entity_type->id() === 'oc_activity') {
-    $fields = array();
     $fields['actors_involved'] = BaseFieldDefinition::create('entity_reference')
       ->setLabel(t('Participants'))
       ->setDescription(t('People involved in this activity. To add one, start typing their name.'))
@@ -51,9 +50,9 @@ function opencase_no_cases_entity_base_field_info($entity_type) {
       ])
       ->setDefaultValueCallback('opencase_no_cases_actors_involved_callback')
       ->setRequired(TRUE);
-  }
       return $fields;
   }
+}
 
 /**
  * When creating an activity, it sets the first involved party to the actor