diff --git a/src/utils/form.py b/src/utils/form.py
index 1504a4995..fb7956d50 100644
--- a/src/utils/form.py
+++ b/src/utils/form.py
@@ -2224,8 +2224,7 @@ def parse_raw_options(
     try:
         model = OptionsModel(**raw_options)
     except ValidationError as e:
-        error = "\n".join([err["msg"] for err in e.errors()])
-        raise YunohostError(error, raw_msg=True)
+        raise YunohostError("While parsing manifest: " + str(e), raw_msg=True)
 
     model.translate_options()