diff --git a/README.rst b/README.rst
index 46a6ba14..3551794d 100644
--- a/README.rst
+++ b/README.rst
@@ -21,9 +21,9 @@ The SDK is available on `PyPI <https://pypi.python.org/pypi/qds_sdk>`_.
 
 From source
 ~~~~~~~~~~~
-* Download the source code:
+* Get the source code:
 
-  - Either clone the project: ``git clone git@github.com:qubole/qds-sdk-py.git``
+  - Either clone the project: ``git clone git@github.com:qubole/qds-sdk-py.git`` and checkout latest release tag from `Releases <https://github.com/qubole/qds-sdk-py/releases>`_.
   
   - Or download one of the releases from https://github.com/qubole/qds-sdk-py/releases
 
diff --git a/qds_sdk/connection.py b/qds_sdk/connection.py
index ede6c412..0398acb5 100644
--- a/qds_sdk/connection.py
+++ b/qds_sdk/connection.py
@@ -152,9 +152,12 @@ def _handle_error(response):
         elif code == 422:
             sys.stderr.write(response.text + "\n")
             raise ResourceInvalid(response)
-        elif code in (449, 502, 503, 504):
+        elif code in (502, 503, 504):
             sys.stderr.write(response.text + "\n")
             raise RetryWithDelay(response)
+        elif code == 449:
+            sys.stderr.write(response.text + "\n")
+            raise RetryWithDelay(response, "Data requested is unavailable. Retrying ...")
         elif 401 <= code < 500:
             sys.stderr.write(response.text + "\n")
             raise ClientError(response)
diff --git a/qds_sdk/exception.py b/qds_sdk/exception.py
index 5e361902..ef06a335 100644
--- a/qds_sdk/exception.py
+++ b/qds_sdk/exception.py
@@ -11,8 +11,9 @@ def __init__(self, message, usage):
 class Error(Exception):
     """A general error derived from Exception."""
 
-    def __init__(self, request):
-        Exception.__init__(self, request.text)
+    def __init__(self, request, message = ""):
+        response = message if message else request.text
+        Exception.__init__(self, response)
         self.request = request