diff --git a/xos/xos/apibase.py b/xos/xos/apibase.py
index 81f58e8..03493ee 100644
--- a/xos/xos/apibase.py
+++ b/xos/xos/apibase.py
@@ -6,32 +6,7 @@
 from rest_framework.exceptions import PermissionDenied as RestFrameworkPermissionDenied
 from django.core.exceptions import PermissionDenied as DjangoPermissionDenied
 from django.core.exceptions import ValidationError as DjangoValidationError
-
-class XOSProgrammingError(APIException):
-    status_code=400
-    def __init__(self, why="programming error", fields={}):
-        APIException.__init__(self, {"error": "XOSProgrammingError",
-                            "specific_error": why,
-                            "fields": fields})
-
-class XOSPermissionDenied(RestFrameworkPermissionDenied):
-    def __init__(self, why="permission error", fields={}):
-        APIException.__init__(self, {"error": "XOSPermissionDenied",
-                            "specific_error": why,
-                            "fields": fields})
-
-class XOSNotAuthenticated(RestFrameworkPermissionDenied):
-    def __init__(self, why="you must be authenticated to use this api", fields={}):
-        APIException.__init__(self, {"error": "XOSNotAuthenticated",
-                            "specific_error": why,
-                            "fields": fields})
-
-class XOSValidationError(APIException):
-    status_code=403
-    def __init__(self, why="validation error", fields={}):
-        APIException.__init__(self, {"error": "XOSValidationError",
-                            "specific_error": why,
-                            "fields": fields})
+from xos.exceptions import *
 
 class XOSRetrieveUpdateDestroyAPIView(generics.RetrieveUpdateDestroyAPIView):
 
@@ -89,10 +64,6 @@
             response=Response({'detail': {"error": "PermissionDenied", "specific_error": str(exc), "fields": {}}}, status=status.HTTP_403_FORBIDDEN)
             response.exception=True
             return response
-        elif isinstance(exc, DjangoValidationError):
-            response=Response({'detail': {"error": "ValidationError", "specific_error": str(exc), "fields": {}}}, status=status.HTTP_400_BAD_REQUEST)
-            response.exception=True
-            return response
         else:
             return super(XOSRetrieveUpdateDestroyAPIView, self).handle_exception(exc)
 
@@ -134,10 +105,6 @@
             response=Response({'detail': {"error": "PermissionDenied", "specific_error": str(exc), "fields": {}}}, status=status.HTTP_403_FORBIDDEN)
             response.exception=True
             return response
-        elif isinstance(exc, DjangoValidationError):
-            response=Response({'detail': {"error": "ValidationError", "specific_error": str(exc), "fields": {}}}, status=status.HTTP_400_BAD_REQUEST)
-            response.exception=True
-            return response
         else:
             return super(XOSListCreateAPIView, self).handle_exception(exc)
 
diff --git a/xos/xos/exceptions.py b/xos/xos/exceptions.py
new file mode 100644
index 0000000..8d4464e
--- /dev/null
+++ b/xos/xos/exceptions.py
@@ -0,0 +1,42 @@
+from rest_framework.exceptions import APIException
+from rest_framework.exceptions import PermissionDenied as RestFrameworkPermissionDenied
+
+class XOSProgrammingError(APIException):
+    status_code=400
+    def __init__(self, why="programming error", fields={}):
+        APIException.__init__(self, {"error": "XOSProgrammingError",
+                            "specific_error": why,
+                            "fields": fields})
+
+class XOSPermissionDenied(RestFrameworkPermissionDenied):
+    def __init__(self, why="permission error", fields={}):
+        APIException.__init__(self, {"error": "XOSPermissionDenied",
+                            "specific_error": why,
+                            "fields": fields})
+
+class XOSNotAuthenticated(RestFrameworkPermissionDenied):
+    def __init__(self, why="you must be authenticated to use this api", fields={}):
+        APIException.__init__(self, {"error": "XOSNotAuthenticated",
+                            "specific_error": why,
+                            "fields": fields})
+
+class XOSValidationError(APIException):
+    status_code=403
+    def __init__(self, why="validation error", fields={}):
+        APIException.__init__(self, {"error": "XOSValidationError",
+                            "specific_error": why,
+                            "fields": fields})
+
+class XOSDuplicateKey(APIException):
+    status_code=400
+    def __init__(self, why="duplicate key", fields={}):
+        APIException.__init__(self, {"error": "XOSDuplicateKey",
+                            "specific_error": why,
+                            "fields": fields})
+
+class XOSConfigurationError(APIException):
+    status_code=400
+    def __init__(self, why="configuration error", fields={}):
+        APIException.__init__(self, {"error": "XOSConfigurationError",
+                            "specific_error": why,
+                            "fields": fields})