diff --git a/app/scodoc/sco_archives.py b/app/scodoc/sco_archives.py
index 3d400f2e..4fd49b41 100644
--- a/app/scodoc/sco_archives.py
+++ b/app/scodoc/sco_archives.py
@@ -203,7 +203,7 @@ class BaseArchiver(object):
             log(
                 f"invalid archive name: {archive_name}, oid={oid}, archive_id={archive_id}"
             )
-            raise ValueError("invalid archive name")
+            raise ScoValueError(f"Archive {archive_name} introuvable")
         return archive_id
 
     def get_archive_description(self, archive_id):
diff --git a/app/scodoc/sco_edit_module.py b/app/scodoc/sco_edit_module.py
index e88e8c8a..15d44004 100644
--- a/app/scodoc/sco_edit_module.py
+++ b/app/scodoc/sco_edit_module.py
@@ -103,7 +103,7 @@ def do_module_create(args) -> int:
     if formation.is_apc():
         ue = UniteEns.query.get(args["ue_id"])
         if int(args.get("semestre_id", 0)) != ue.semestre_idx:
-            raise ValueError("Formation incompatible: contacter le support ScoDoc")
+            raise ScoValueError("Formation incompatible: contacter le support ScoDoc")
     # create
     cnx = ndb.GetDBConnexion()
     module_id = _moduleEditor.create(cnx, args)
diff --git a/app/scodoc/sco_groups.py b/app/scodoc/sco_groups.py
index c9416d2c..b2143109 100644
--- a/app/scodoc/sco_groups.py
+++ b/app/scodoc/sco_groups.py
@@ -105,7 +105,7 @@ def get_group(group_id: int) -> dict:
         {"group_id": group_id},
     )
     if not r:
-        raise ValueError("invalid group_id (%s)" % group_id)
+        raise ScoValueError(f"Groupe inexistant ! (id {group_id})")
     return r[0]