diff --git a/weboob/tools/backend.py b/weboob/tools/backend.py
index d103e980..f9df23f5 100644
--- a/weboob/tools/backend.py
+++ b/weboob/tools/backend.py
@@ -92,7 +92,7 @@ class BaseBackend(object):
             self.is_masked = is_masked
             self.regexp = regexp
             self.description = description
-            self.choices=None
+            self.choices = choices
 
     class ConfigError(Exception): pass
 
@@ -132,12 +132,13 @@ class BaseBackend(object):
                 elif isinstance(field.default, float) and not isinstance(value, float):
                     value = float(value)
 
+            print value, field.choices
             if field.choices:
                 if (isinstance(field.choices, (tuple,list)) and not value in field.choices) or \
                    (isinstance(field.choices, dict) and not value in field.choices.iterkeys()):
-                    raise BaseBackend.ConfigError('Value of "%s" might be in this list: %s' %
+                    raise BaseBackend.ConfigError('Value of "%s" might be in this list: %s' % (name,
                                                   ', '.join([s for s in (field.choices.iterkeys() if isinstance(field.choices, dict)
-                                                                                                  else field.choices)]))
+                                                                                                  else field.choices)])))
             self.config[name] = value
         self.storage = BackendStorage(self.name, storage)
         self.storage.load(self.STORAGE)