Cast error message to str

Author: ehdsouza

watson_developer_cloud/watson_service.py

@@ -77,7 +77,7 @@ def __init__(self, code, message, info=None, httpResponse=None):
 
 
     def __str__(self):
-        msg = 'Error: ' + self.message + ', Code: ' + str(self.code)
+        msg = 'Error: ' + str(self.message) + ', Code: ' + str(self.code)
         if self.transactionId is not None:
             msg += ' , X-dp-watson-tran-id: ' + str(self.transactionId)
         if self.globalTransactionId is not None: