diff --git a/src/Bundle/ChillMainBundle/Controller/ExportController.php b/src/Bundle/ChillMainBundle/Controller/ExportController.php
index bc3f994a7..5dcd158f6 100644
--- a/src/Bundle/ChillMainBundle/Controller/ExportController.php
+++ b/src/Bundle/ChillMainBundle/Controller/ExportController.php
@@ -405,7 +405,7 @@ class ExportController extends AbstractController
             'alias' => $alias,
         ];
         unset($parameters['_token']);
-        $key = md5(uniqid(mt_rand(), false));
+        $key = md5(uniqid((string) mt_rand(), false));
 
         $this->redis->setEx($key, 3600, serialize($parameters));
 
diff --git a/src/Bundle/ChillMainBundle/Form/Type/Export/PickCenterType.php b/src/Bundle/ChillMainBundle/Form/Type/Export/PickCenterType.php
index 2fe5ff8f2..9c36d452f 100644
--- a/src/Bundle/ChillMainBundle/Form/Type/Export/PickCenterType.php
+++ b/src/Bundle/ChillMainBundle/Form/Type/Export/PickCenterType.php
@@ -75,14 +75,16 @@ class PickCenterType extends AbstractType
 
     public function buildForm(FormBuilderInterface $builder, array $options)
     {
+
+
         $export = $this->exportManager->getExport($options['export_alias']);
         $centers = $this->authorizationHelper->getReachableCenters(
             $this->user,
-            $export->requiredRole()
+            (string) $export->requiredRole()
         );
 
         $builder->add(self::CENTERS_IDENTIFIERS, EntityType::class, [
-            'class' => 'ChillMainBundle:Center',
+            'class' => Center::class,
             'query_builder' => static function (EntityRepository $er) use ($centers) {
                 $qb = $er->createQueryBuilder('c');
                 $ids = array_map(