Fix typo in _add_named_config
@@ -198,7 +198,7 @@ class Ingredient(object):
def _add_named_config(self, name, conf):
if name in self.named_configs:
- raise KeyError('Configuration name "{}" already in use!')
+ raise KeyError('Configuration name "{}" already in use!'.format(name))
self.named_configs[name] = conf
@staticmethod
