The command 'drush.php provision setup' could not be executed

Maybe you can see a problem with my installation.

When I get to the final step of the Hostslav install and try to run provision setup here's what happens:

brian@raven:/var/www/drupal-6/cores/platform-6-10$ sites/default/modules/drush/drush.php provision setup
warning: Invalid argument supplied for foreach() in                                                                             [warning]
/var/www/drupal-6/cores/platform-6-10/sites/default/modules/provision/provision.module on line 54.
The command 'drush.php provision setup' could not be executed.                                                                  [error]

brian@raven:/var/www/drupal-6/cores/platform-6-10$ ./drush.php provision setup --verbose
Initialized Drupal 6.11-dev root directory at /var/www/drupal-6/cores/platform-6-10                                             [notice]
Initialized Drupal site default at sites/default                                                                                [notice]
notice: Use of undefined constant PROVISION_SUCCESS - assumed 'PROVISION_SUCCESS' in                                            [notice]
/var/www/drupal-6/cores/platform-6-10/sites/default/modules/provision/provision.inc on line 182.
warning: Invalid argument supplied for foreach() in                                                                             [warning]
/var/www/drupal-6/cores/platform-6-10/sites/default/modules/provision/provision.module on line 54.
The command 'drush.php provision setup' could not be executed.                                                                  [error]
                                                   [error]

Versions:
provision checkout:

cvs -d :pserver:anonymous:anonymous@cvs.drupal.org:/cvs/drupal-contrib co -r DRUPAL-5--0-1 -d sites/default/modules/provision contributions/modules/provision

Drush:

http://ftp.drupal.org/files/projects/drush-HEAD-all-versions.tar.gz

Here's how I've got things installed:

brian@raven:/var/www/drupal-6/cores/platform-6-10$ ll
total 240
drwxr-xr-x 10 brian brian  4096 2009-04-19 15:43 ./
drwxrwxr-x  7 root  admin  4096 2009-04-19 14:52 ../
-rw-r--r--  1 brian brian 41152 2009-02-25 15:16 CHANGELOG.txt
-rw-r--r--  1 brian brian   981 2008-02-06 04:45 COPYRIGHT.txt
-rw-r--r--  1 brian brian   262 2006-08-09 00:42 cron.php
drwxr-xr-x  2 brian brian  4096 2009-04-19 14:27 CVS/
lrwxrwxrwx  1 brian brian    37 2009-04-19 15:43 drush.php -> sites/default/modules/drush/drush.php*
-rw-r--r--  1 brian brian  3837 2008-12-10 12:04 .htaccess
drwxr-xr-x  3 brian brian  4096 2009-04-19 14:28 includes/
-rw-r--r--  1 brian brian   980 2007-12-26 00:46 index.php
-rw-r--r--  1 brian brian  1308 2007-11-19 11:53 INSTALL.mysql.txt
-rw-r--r--  1 brian brian  1075 2007-11-26 08:36 INSTALL.pgsql.txt
-rw-r--r--  1 brian brian 46930 2009-02-25 03:47 install.php
-rw-r--r--  1 brian brian 15646 2008-07-09 12:15 INSTALL.txt
-rw-r--r--  1 brian brian 18048 2009-01-06 09:27 LICENSE.txt
-rw-r--r--  1 brian brian  1978 2008-05-15 15:13 MAINTAINERS.txt
drwxr-xr-x  4 brian brian  4096 2009-04-19 14:27 misc/
drwxr-xr-x 36 brian brian  4096 2009-04-19 14:28 modules/
drwxr-xr-x  5 brian brian  4096 2009-04-19 14:29 profiles/
-rw-r--r--  1 brian brian  1590 2008-12-10 12:12 robots.txt
drwxr-xr-x  3 brian brian  4096 2009-04-19 14:28 scripts/
drwxr-xr-x  5 brian brian  4096 2009-04-19 14:28 sites/
drwxr-xr-x  8 brian brian  4096 2009-04-19 14:28 themes/
-rw-r--r--  1 brian brian 25457 2009-03-30 04:15 update.php
-rw-r--r--  1 brian brian  5002 2008-01-04 08:15 UPGRADE.txt
-rw-r--r--  1 brian brian   352 2005-12-10 11:26 xmlrpc.php

brian@raven:/var/www/drupal-6/cores/platform-6-10$ ll sites/default/modules/
total 92
drwxr-xr-x 6 brian brian  4096 2009-04-19 15:52 ./
drwxr-xr-x 5 brian brian  4096 2009-04-19 14:53 ../
drwxr-xr-x 2 brian brian  4096 2009-04-19 14:29 CVS/
drwxr-xr-x 3 brian brian  4096 2009-04-19 14:28 cvs_deploy/
drwxr-xr-x 4 brian brian  4096 2009-04-19 05:08 drush/
-rw-r--r-- 1 brian brian 64384 2009-04-19 05:08 drush-HEAD-all-versions.tar.gz
drwxr-xr-x 6 brian brian  4096 2009-02-05 17:10 provision/

brian@raven:/var/www/drupal-6/cores/platform-6-10$ ll profiles/hostslave/
total 24
drwxr-xr-x 4 brian brian 4096 2009-04-19 15:15 ./
drwxr-xr-x 5 brian brian 4096 2009-04-19 14:29 ../
drwxr-xr-x 2 brian brian 4096 2009-04-19 14:29 CVS/
-rw-r--r-- 1 brian brian 2147 2009-04-19 15:26 hostslave.profile
drwxr-xr-x 2 brian brian 4096 2009-04-19 15:20 modules/
-rw-r--r-- 1 brian brian  828 2008-10-20 10:12 README.txt

brian@raven:/var/www/drupal-6/cores/platform-6-10$ ll profiles/hostslave/modules/
total 8
drwxr-xr-x 2 brian brian 4096 2009-04-19 15:20 ./
drwxr-xr-x 4 brian brian 4096 2009-04-19 15:15 ../