fix error when having two address at same date

Entity/Person.php

@@ -723,11 +723,11 @@ class Person implements HasCenterInterface {
     public function isAddressesValid(ExecutionContextInterface $context)
     {
         if ($this->hasTwoAdressWithSameValidFromDate()) {
-            $context->addViolationAt(
-                'addresses',
-                'Two addresses has the same validFrom date',
-                array()
-            );
+            $context
+                ->buildViolation('Two addresses has the same validFrom date')
+                ->atPath('addresses')
+                ->addViolation()
+                ;
         }
     }