The drush command 'rets-import' could not be found I believe I have all the pieces of the Drupal RETS Real Estate Framework installed in my drupal 7 site. 

https://www.drupal.org/project/drealty

But when I run:

drush -u=admin -d rets-import 


I get: 

The drush command 'rets-import' could not be found.  Run `drush cache-clear drush` to clear the commandfile cache if you have installed new extensions.


What step might I have missed in my install of this framework?
The file that integrates DRealty with Drush drealty.drush.inc is kind of in an odd place within a drush folder of the module.

http://cgit.drupalcode.org/drealty/tree/drush/drealty.drush.inc

Drush will scan the root level of a module folder or your .drush directory for drush include files but I dont think it will randomly scan deeply into module directories. I recommend moving this file into your .drush folder and clearing the cache, then trying from your site folder again. Eg,


cp ./drealty/drush/drealty.drush.inc ~/.drush
drush cc drush
cd YOUR_DRUPAL_PROJECT/sites/all/modules
drush -u=admin -d rets-import