diff --git a/weboob/capabilities/base.py b/weboob/capabilities/base.py
index 95f0966a..ccda5a61 100644
--- a/weboob/capabilities/base.py
+++ b/weboob/capabilities/base.py
@@ -206,7 +206,6 @@ class _CapBaseObjectMeta(type):
             new_class._fields = deepcopy(new_class._fields)
         new_class._fields.update(fields)
 
-        assert new_class.__doc__ is not None
         if new_class.__doc__ is None:
             new_class.__doc__ = ''
         for name, field in fields:
diff --git a/weboob/core/repositories.py b/weboob/core/repositories.py
index f336d5cf..38c40409 100644
--- a/weboob/core/repositories.py
+++ b/weboob/core/repositories.py
@@ -271,7 +271,7 @@ class Repository(object):
             try:
                 module = Module(__import__(name, fromlist=[str(name)]))
             except Exception, e:
-                print >>sys.stderr, 'Unable to build module %s: %s' % (name, e)
+                print >>sys.stderr, 'Unable to build module %s: [%s] %s' % (name, type(e), e)
             else:
                 m = ModuleInfo(module.name)
                 m.version = self.get_tree_mtime(module_path)