Shortcodes for tree & all packages not working

Thanks for a pretty cool plugin. The shortcodes [wpdm_tree] and [wpdm_all_packages] don’t seem to be working. I have installed v2.7.0 of the plugin. You can see the error page here – http://thecodeisclear.in/downloads/

The default shortcode for downloads is working (http://thecodeisclear.in/smooth-gradients-for-photoshop-free-download/), so I don’t know where the issue is (theme/plugin conflict). Please help!

https://wordpress.org/plugins/download-manager/