Error when trying to export File entities

Hey,

I have the following setup: Uuid (dev), Entity dependency (dev) and Deploy (dev) and did what this document describes: https://drupal.org/node/1982890.
I've also installed the Media module.
I am trying to export media files in a feature, so I created a simple View that lists all files and specified that View in a deploy plan, making use of the Views aggregator. Now every time I go to the /admin/structure/deploy page, I get the following error:

Fatal error: Cannot access empty property in /vagrant_sites/ip.dev/htdocs/profiles/ip/modules/contrib/deploy/modules/deploy_aggregator_views/plugins/DeployAggregatorViews.inc on line 49