drush feeds-list

how to explain:

/www/prod/sites/default$ drush feeds-list
Command feeds-list needs the following module(s) enabled to run: drush_feeds_import. [error]
The drush command 'feeds-list' could not be executed.
/www/prod/sites/default$ drush en drush_feeds_import
drush_feeds_import is already enabled. [ok]
There were no extensions that could be enabled.

I have cleared the cache
I have submitted the following command : drush rr

Any ideas?

Thanks

Didier