diff --git a/app/scodoc/sco_archives.py b/app/scodoc/sco_archives.py
index 159d3305a..0103caa24 100644
--- a/app/scodoc/sco_archives.py
+++ b/app/scodoc/sco_archives.py
@@ -70,13 +70,13 @@ from app.scodoc.sco_exceptions import (
 )
 from app.scodoc import html_sco_header
 from app.scodoc import sco_bulletins_pdf
-from app.scodoc import sco_excel
 from app.scodoc import sco_formsemestre
 from app.scodoc import sco_groups
 from app.scodoc import sco_groups_view
 from app.scodoc import sco_permissions_check
 from app.scodoc import sco_pvjury
 from app.scodoc import sco_pvpdf
+from app.scodoc.sco_exceptions import ScoValueError
 
 
 class BaseArchiver(object):
@@ -254,7 +254,7 @@ class BaseArchiver(object):
         self.initialize()
         if not scu.is_valid_filename(filename):
             log('Archiver.get: invalid filename "%s"' % filename)
-            raise ValueError("invalid filename")
+            raise ScoValueError("archive introuvable (déjà supprimée ?)")
         fname = os.path.join(archive_id, filename)
         log("reading archive file %s" % fname)
         with open(fname, "rb") as f: