diff --git a/dogesec_commons/stixifier/serializers.py b/dogesec_commons/stixifier/serializers.py
index 3a8343a..f799215 100644
--- a/dogesec_commons/stixifier/serializers.py
+++ b/dogesec_commons/stixifier/serializers.py
@@ -26,7 +26,7 @@ def validate_model(model):
     try:
         extractor = txt2stix.txt2stix.parse_model(model)
     except BaseException as e:
-        raise ValidationError(str(e))
+        raise ValidationError(f"invalid model: {model}")
     return model
 
 def validate_extractor(typestr, types, name):
diff --git a/dogesec_commons/stixifier/summarizer.py b/dogesec_commons/stixifier/summarizer.py
index a4441ba..a1058c8 100644
--- a/dogesec_commons/stixifier/summarizer.py
+++ b/dogesec_commons/stixifier/summarizer.py
@@ -51,10 +51,12 @@ def parse_summarizer_model(value: str):
         splits = value.split(':', 1)
         provider = splits[0]
         if provider not in ALL_AI_EXTRACTORS:
-            raise Exception(f"invalid summary provider in `{value}`, must be one of [{list(ALL_AI_EXTRACTORS)}]")
+            raise ValidationError(f"invalid summary provider in `{value}`, must be one of [{list(ALL_AI_EXTRACTORS)}]")
         provider = get_provider(ALL_AI_EXTRACTORS[provider])
         if len(splits) == 2:
             return provider(model=splits[1])
         return provider()
+    except ValidationError:
+        raise
     except BaseException as e:
-        raise ValidationError(str(e)) from e
\ No newline at end of file
+        raise ValidationError(f'invalid model: {value}') from e
\ No newline at end of file