diff --git a/src/Bot/Client.php b/src/Bot/Client.php
index 56a8369..579894e 100644
--- a/src/Bot/Client.php
+++ b/src/Bot/Client.php
@@ -94,7 +94,17 @@ class Client
             if ($arrayOfObjects) {
                 return new ListResponse($responseType, $data);
             } else {
-                return new $responseType($data);
+                $obj = Serializer::deserialize($data, $responseType, Serializer::S_ARRAY);
+
+                if ($response->getStatusCode() >= 400
+                    && method_exists($obj, 'setErrors')
+                    && method_exists($obj, 'getErrors')
+                    && count(call_user_func([$obj, 'getErrors'])) == 0
+                ) {
+                    call_user_func_array([$obj, 'setErrors'], [['Status Code ' . $response->getStatusCode()]]);
+                }
+
+                return $obj;
             }
         } else {
             throw new InvalidJsonException('Received invalid JSON', 1);
@@ -251,7 +261,7 @@ class Client
             HttpClient::METHOD_PUT,
             $request,
             static::getResponseClass(self::ERROR_ONLY_RESPONSE),
-            true
+            Serializer::S_JSON
         );
     }
 
diff --git a/src/Bot/HttpClient.php b/src/Bot/HttpClient.php
index 616fd4e..8b3deac 100644
--- a/src/Bot/HttpClient.php
+++ b/src/Bot/HttpClient.php
@@ -203,7 +203,7 @@ class HttpClient
      */
     private function validateRequest($class)
     {
-        if (method_exists($class, 'validate')) {
+        if (!is_string($class) && method_exists($class, 'validate')) {
             $errors = $class->validate();
         } else {
             $validator = Validation::createValidatorBuilder()
@@ -213,7 +213,7 @@ class HttpClient
             $errors = $validator->validate($class);
         }
 
-        if ((is_object($errors) && $errors->count() > 0) || is_string($errors)) {
+        if ((is_object($errors) && call_user_func([$errors, 'count']) > 0) || is_string($errors)) {
             $message = (string) $errors;
             throw new InvalidArgumentException($message);
         }
diff --git a/src/Bot/Model/Entity/Chat/ChatLastMessage.php b/src/Bot/Model/Entity/Chat/ChatLastMessage.php
index 08b366d..0026569 100644
--- a/src/Bot/Model/Entity/Chat/ChatLastMessage.php
+++ b/src/Bot/Model/Entity/Chat/ChatLastMessage.php
@@ -73,17 +73,17 @@ class ChatLastMessage
     }
 
     /**
-     * @return string
+     * @return \DateTime
      */
-    public function getTime(): string
+    public function getTime(): \DateTime
     {
         return $this->time;
     }
 
     /**
-     * @param string $time
+     * @param \DateTime $time
      */
-    public function setTime(string $time)
+    public function setTime(\DateTime $time)
     {
         $this->time = $time;
     }
diff --git a/src/Bot/Model/Request/MessageSendRequest.php b/src/Bot/Model/Request/MessageSendRequest.php
index 254134f..f89550f 100644
--- a/src/Bot/Model/Request/MessageSendRequest.php
+++ b/src/Bot/Model/Request/MessageSendRequest.php
@@ -16,6 +16,8 @@ namespace RetailCrm\Mg\Bot\Model\Request;
 use JMS\Serializer\Annotation\Accessor;
 use JMS\Serializer\Annotation\SkipWhenEmpty;
 use JMS\Serializer\Annotation\Type;
+use RetailCrm\Mg\Bot\Model\Entity\Message\MessageOrder;
+use RetailCrm\Mg\Bot\Model\Entity\Message\MessageProduct;
 use Symfony\Component\Validator\Constraints as Assert;
 use RetailCrm\Mg\Bot\Model\Entity\Order;
 use RetailCrm\Mg\Bot\Model\Entity\Product;
@@ -52,7 +54,7 @@ class MessageSendRequest
     private $content;
 
     /**
-     * @var Product $product
+     * @var MessageProduct $product
      *
      * @Type("Product")
      * @Accessor(getter="getProduct",setter="setProduct")
@@ -61,7 +63,7 @@ class MessageSendRequest
     private $product;
 
     /**
-     * @var Order $order
+     * @var MessageOrder $order
      *
      * @Type("Order")
      * @Accessor(getter="getOrder",setter="setOrder")
@@ -174,7 +176,7 @@ class MessageSendRequest
     }
 
     /**
-     * @return Product
+     * @return MessageProduct
      */
     public function getProduct()
     {
@@ -182,15 +184,15 @@ class MessageSendRequest
     }
 
     /**
-     * @param Product $product
+     * @param MessageProduct $product
      */
-    public function setProduct(Product $product)
+    public function setProduct(MessageProduct $product)
     {
         $this->product = $product;
     }
 
     /**
-     * @return Order
+     * @return MessageOrder
      */
     public function getOrder()
     {
@@ -198,9 +200,9 @@ class MessageSendRequest
     }
 
     /**
-     * @param Order $order
+     * @param MessageOrder $order
      */
-    public function setOrder(Order $order)
+    public function setOrder(MessageOrder $order)
     {
         $this->order = $order;
     }
diff --git a/src/Bot/Model/Response/CommonFields.php b/src/Bot/Model/Response/CommonFields.php
index 72891d6..18b121b 100644
--- a/src/Bot/Model/Response/CommonFields.php
+++ b/src/Bot/Model/Response/CommonFields.php
@@ -43,7 +43,7 @@ trait CommonFields
      */
     public function getErrors(): array
     {
-        return $this->errors;
+        return is_null($this->errors) ? [] : $this->errors;
     }
 
     /**
@@ -59,6 +59,6 @@ trait CommonFields
      */
     public function isSuccessful()
     {
-        return (bool) empty($this->getErrors());
+        return empty($this->errors);
     }
 }
diff --git a/src/Bot/Model/Response/ListResponse.php b/src/Bot/Model/Response/ListResponse.php
index 721cb3d..7032fd2 100644
--- a/src/Bot/Model/Response/ListResponse.php
+++ b/src/Bot/Model/Response/ListResponse.php
@@ -45,8 +45,8 @@ class ListResponse implements \Iterator, \ArrayAccess, \Countable {
     /**
      * ListResponse constructor.
      *
-     * @param $responseType
-     * @param $data
+     * @param string $responseType
+     * @param array $data
      */
     public function __construct($responseType, $data)
     {
@@ -149,7 +149,7 @@ class ListResponse implements \Iterator, \ArrayAccess, \Countable {
     }
 
     /**
-     * @param $name
+     * @param mixed $name
      *
      * @return mixed
      * @internal
diff --git a/src/Serializer.php b/src/Serializer.php
index 25244c7..77e5cc7 100644
--- a/src/Serializer.php
+++ b/src/Serializer.php
@@ -62,8 +62,8 @@ class Serializer
     /**
      * Deserialize given array or JSON to object
      *
-     * @param $data
-     * @param $entityType
+     * @param mixed $data
+     * @param string self::normalizeNamespace($entityType)
      * @param string $from
      *
      * @return array|object|null
@@ -76,10 +76,10 @@ class Serializer
 
         switch ($from) {
             case self::S_ARRAY:
-                $deserialized = $serializer->fromArray(array_filter($data), $entityType, $context);
+                $deserialized = $serializer->fromArray(array_filter($data), self::normalizeNamespace($entityType), $context);
                 break;
             case self::S_JSON:
-                $deserialized = $serializer->deserialize($data, $entityType, $from, $context);
+                $deserialized = $serializer->deserialize($data, self::normalizeNamespace($entityType), $from, $context);
                 break;
         }
 
@@ -103,4 +103,18 @@ class Serializer
 
         return $context;
     }
+
+    /**
+     * @param string $namespace
+     *
+     * @return bool|string
+     */
+    private static function normalizeNamespace(string $namespace)
+    {
+        if (substr($namespace, 0, 1) == '\\') {
+            return substr($namespace, 1);
+        } else {
+            return $namespace;
+        }
+    }
 }
diff --git a/tests/Bot/Tests/CommandsTest.php b/tests/Bot/Tests/CommandsTest.php
index acafd7c..15a4311 100644
--- a/tests/Bot/Tests/CommandsTest.php
+++ b/tests/Bot/Tests/CommandsTest.php
@@ -89,7 +89,7 @@ class CommandsTest extends TestCase
         $response = $client->commandEdit($request);
 
         self::assertTrue($response instanceof ErrorOnlyResponse);
-        self::assertTrue(!$response->isError());
+        self::assertTrue($response->isSuccessful());
     }
 
     /**
@@ -108,6 +108,6 @@ class CommandsTest extends TestCase
 
         $response = $client->commandDelete("show_payment_types");
 
-        self::assertTrue($response->isError() == false);
+        self::assertTrue($response->isSuccessful() == true);
     }
 }
diff --git a/tests/Bot/Tests/MessagesTest.php b/tests/Bot/Tests/MessagesTest.php
index 72c33c9..c2ad240 100644
--- a/tests/Bot/Tests/MessagesTest.php
+++ b/tests/Bot/Tests/MessagesTest.php
@@ -52,7 +52,7 @@ class MessagesTest extends TestCase
 
         $response = $client->messageSend($request);
 
-        self::assertTrue($response->isError());
+        self::assertTrue(!$response->isSuccessful());
         self::assertEquals(1, count($response->getErrors()));
     }
 }