diff --git a/cml/shared/errors.py b/cml/shared/errors.py
index a45f95e2d6298b6f60cc1623ac1432bd736d8187..966f47c812014b5a78be77294ef9c008402d244f 100644
--- a/cml/shared/errors.py
+++ b/cml/shared/errors.py
@@ -10,3 +10,11 @@ class NoModelReconstructedError(BaseError):
 
 class DeconstructionFailed(BaseError):
     pass
+
+
+class NotEnoughFeaturesWarning(BaseError):
+    pass
+
+
+class NotReducableLearnblockWarning(BaseError):
+    pass