diff --git a/src/Core/HttpClients/GuzzleHttpClient.php b/src/Core/HttpClients/GuzzleHttpClient.php
index 490ad40e..2e92e912 100644
--- a/src/Core/HttpClients/GuzzleHttpClient.php
+++ b/src/Core/HttpClients/GuzzleHttpClient.php
@@ -57,7 +57,7 @@ public function makeAPICall($url, $method, array $headers, $body, $timeOut, $ver
             return $this->getLastResponse();
         } catch(RequestException $e){
             if($e->hasResponse()){
-                throw new SdkException("A networking error occurs during Guzzle client request:" . Psr7\str($e->getResponse()));
+                throw new SdkException("A networking error occurs during Guzzle client request:" . Psr7\Message::toString($e->getResponse()));
             }else{
                 throw new SdkException("Network Error:" . $e->getMessage());
             }