I just installed Phabricator and am attempting to add a new repository:

When I click Repository->Create New Repository I see the following error on the UI:
Unhandled Exception ("Exception")
No Diffusion request object!
Stack Trace
Depth Library File Where
3 phabricator applications/diffusion/controller/DiffusionController.php : 44 DiffusionController::getDiffusionRequest()
2 phabricator applications/diffusion/controller/DiffusionRepositoryNewController.php : 84 DiffusionController::buildApplicationPage()
1 /opt/phabricator/phabricator/webroot/index.php : 95 DiffusionRepositoryNewController::processRequest()

and the following in the error.log:

[Wed Apr 30 17:11:31 2014] [error] [client 10.41.15.247] [2014-04-30 10:11:31] EXCEPTION: (Exception) No Diffusion request object! at [/opt/phabricator/phabricator/src/applications/diffusion/controller/DiffusionController.php:14]
[Wed Apr 30 17:11:31 2014] [error] [client 10.41.15.247] #0 DiffusionController::getDiffusionRequest() called at [/opt/phabricator/phabricator/src/applications/diffusion/controller/DiffusionController.php:44]
[Wed Apr 30 17:11:31 2014] [error] [client 10.41.15.247] #1 DiffusionController::buildApplicationPage(Array of size 2 starting with: { 0 => Object PhabricatorCrumbsView }, Array of size 2 starting with: { title => New Repository }) called at [/opt/phabricator/phabricator/src/applications/diffusion/controller/DiffusionRepositoryNewController.php:84]
[Wed Apr 30 17:11:31 2014] [error] [client 10.41.15.247] #2 DiffusionRepositoryNewController::processRequest() called at [/opt/phabricator/phabricator/webroot/index.php:95]