diff --git a/ITPlanning/api/__init__.py b/ITPlanning/api/__init__.py
index 6bc74ac..6e5a747 100644
--- a/ITPlanning/api/__init__.py
+++ b/ITPlanning/api/__init__.py
@@ -1,7 +1,8 @@
 from flask import Blueprint
 
-api = Blueprint("api",__name__)
+api = Blueprint("api", __name__)
 
+from .errors import *
 from .appointement import *
 from .planning import *
 from .service import *
diff --git a/ITPlanning/api/errors.py b/ITPlanning/api/errors.py
new file mode 100644
index 0000000..cd9cf56
--- /dev/null
+++ b/ITPlanning/api/errors.py
@@ -0,0 +1,22 @@
+from pony.orm import rollback
+from pony.orm import ObjectNotFound
+from .exception import ServerError, NotFound, GenericError
+from . import api
+
+
+@api.errorhandler(ValueError)
+def value_error(e):
+    rollback()
+    return GenericError("{0.__class__.__name__}: {0}".format(e))
+
+
+@api.errorhandler(ObjectNotFound)
+def object_not_found(e):
+    rollback()
+    return NotFound(e.entity.__name__)
+
+
+@api.errorhandler(500)
+def generic_error(e):  # pragma: nocover
+    rollback()
+    return ServerError("{0.__class__.__name__}: {0}".format(e))