updated composer

vendor/symfony/routing/Loader/Configurator/CollectionConfigurator.php

@@ -38,6 +38,16 @@ class CollectionConfigurator
         $this->parentPrefixes = $parentPrefixes;
     }
 
+    public function __sleep()
+    {
+        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
+    }
+
+    public function __wakeup()
+    {
+        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
+    }
+
     public function __destruct()
     {
         if (null === $this->prefixes) {

vendor/symfony/routing/Loader/Configurator/ImportConfigurator.php

@@ -30,6 +30,16 @@ class ImportConfigurator
         $this->route = $route;
     }
 
+    public function __sleep()
+    {
+        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
+    }
+
+    public function __wakeup()
+    {
+        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
+    }
+
     public function __destruct()
     {
         $this->parent->addCollection($this->route);