diff --git a/src/Error.php b/src/Error.php
index 54edb52..6b46c3b 100644
--- a/src/Error.php
+++ b/src/Error.php
@@ -95,7 +95,7 @@ class Error extends \Exception implements \JsonSerializable
      */
     public static function formatError(Error $error)
     {
-        return FormattedError::create($error->getMessage(), $error->getLocations());
+        return $error->toSerializableArray();
     }
 
     /**
@@ -179,7 +179,10 @@ class Error extends \Exception implements \JsonSerializable
             'message' => $this->getMessage(),
         ];
 
-        $locations = Utils::map($this->getLocations(), function(SourceLocation $loc) {return $loc->toArray();});
+        $locations = Utils::map($this->getLocations(), function(SourceLocation $loc) {
+            return $loc->toSerializableArray();
+        });
+
         if (!empty($locations)) {
             $arr['locations'] = $locations;
         }
diff --git a/src/Executor/Executor.php b/src/Executor/Executor.php
index 7c4d94c..48632af 100644
--- a/src/Executor/Executor.php
+++ b/src/Executor/Executor.php
@@ -222,8 +222,9 @@ class Executor
     {
         $results = [];
         foreach ($fields as $responseName => $fieldASTs) {
-            $path[] = $responseName;
-            $result = self::resolveField($exeContext, $parentType, $sourceValue, $fieldASTs, $path);
+            $fieldPath = $path;
+            $fieldPath[] = $responseName;
+            $result = self::resolveField($exeContext, $parentType, $sourceValue, $fieldASTs, $fieldPath);
 
             if ($result !== self::$UNDEFINED) {
                 // Undefined means that field is not defined in schema
diff --git a/src/FormattedError.php b/src/FormattedError.php
index efeee2e..934743d 100644
--- a/src/FormattedError.php
+++ b/src/FormattedError.php
@@ -6,6 +6,7 @@ use GraphQL\Language\SourceLocation;
 class FormattedError
 {
     /**
+     * @deprecated since 2016-10-21
      * @param $error
      * @param SourceLocation[] $locations
      * @return array