Call to undefined function user_access()

I've been running drush fine lately, and for some reason I started getting the following error when I try to run the dl command:

PHP Fatal error:  Call to undefined function user_access() in /Users/steve/Sites/cbb/sites/all/modules/rdf/rdf.module on line 24
PHP Stack trace:
PHP   1. {main}() /Users/steve/Sites/drush/drush.php:0
PHP   2. drush_main() /Users/steve/Sites/drush/drush.php:41
PHP   3. drush_dispatch() /Users/steve/Sites/drush/drush.php:91
PHP   4. call_user_func_array() /Users/steve/Sites/drush/includes/drush.inc:51
PHP   5. drush_command() /Users/steve/Sites/drush/includes/drush.inc:0
PHP   6. call_user_func_array() /Users/steve/Sites/drush/includes/command.inc:378
PHP   7. drush_invoke() /Users/steve/Sites/drush/includes/command.inc:0
PHP   8. call_user_func_array() /Users/steve/Sites/drush/includes/command.inc:327
PHP   9. drush_pm_download() /Users/steve/Sites/drush/includes/command.inc:0
PHP  10. drush_bootstrap_max() /Users/steve/Sites/drush/commands/pm/pm.drush.inc:1139
PHP  11. drush_bootstrap() /Users/steve/Sites/drush/includes/environment.inc:252
PHP  12. _drush_bootstrap_drupal_full() /Users/steve/Sites/drush/includes/environment.inc:172
PHP  13. drupal_bootstrap() /Users/steve/Sites/drush/includes/environment.inc:739
PHP  14. _drupal_bootstrap() /Users/steve/Sites/cbb/includes/bootstrap.inc:989
PHP  15. _drupal_bootstrap_full() /Users/steve/Sites/cbb/includes/bootstrap.inc:1078
PHP  16. module_invoke_all() /Users/steve/Sites/cbb/includes/common.inc:2613
PHP  17. call_user_func_array() /Users/steve/Sites/cbb/includes/module.inc:471
PHP  18. rdf_init() /Users/steve/Sites/cbb/includes/module.inc:0

Fatal error: Call to undefined function user_access() in /Users/steve/Sites/cbb/sites/all/modules/rdf/rdf.module on line 24

Call Stack:
    0.0008      99900   1. {main}() /Users/steve/Sites/drush/drush.php:0
    0.0136    1172236   2. drush_main() /Users/steve/Sites/drush/drush.php:41
    0.0805    2481440   3. drush_dispatch() /Users/steve/Sites/drush/drush.php:91
    0.0813    2482764   4. call_user_func_array() /Users/steve/Sites/drush/includes/drush.inc:51
    0.0813    2482764   5. drush_command() /Users/steve/Sites/drush/includes/drush.inc:0
    0.0815    2483568   6. call_user_func_array() /Users/steve/Sites/drush/includes/command.inc:378
    0.0815    2483568   7. drush_invoke() /Users/steve/Sites/drush/includes/command.inc:0
    0.0826    2491048   8. call_user_func_array() /Users/steve/Sites/drush/includes/command.inc:327
    0.0826    2491128   9. drush_pm_download() /Users/steve/Sites/drush/includes/command.inc:0
    0.0826    2493796  10. drush_bootstrap_max() /Users/steve/Sites/drush/commands/pm/pm.drush.inc:1139
    0.2524    3541532  11. drush_bootstrap() /Users/steve/Sites/drush/includes/environment.inc:252
    0.2526    3542316  12. _drush_bootstrap_drupal_full() /Users/steve/Sites/drush/includes/environment.inc:172
    0.2526    3583436  13. drupal_bootstrap() /Users/steve/Sites/drush/includes/environment.inc:739
    0.2659    4587116  14. _drupal_bootstrap() /Users/steve/Sites/cbb/includes/bootstrap.inc:989
    0.2739    5246780  15. _drupal_bootstrap_full() /Users/steve/Sites/cbb/includes/bootstrap.inc:1078
    0.9677   21412108  16. module_invoke_all() /Users/steve/Sites/cbb/includes/common.inc:2613
    0.9685   21416072  17. call_user_func_array() /Users/steve/Sites/cbb/includes/module.inc:471
    0.9686   21416092  18. rdf_init() /Users/steve/Sites/cbb/includes/module.inc:0

Drush command could not be completed.                

I've read through this issue and verified that the code in the patch is applied, but I still get the error. If I disable the module in the error message, I get the same error on another module, so it definitely isn't a problem with the module itself

Thanks.