I am unable to install the "Releeph" application on our Phabricator install. If I go to the /applications/view/PhabricatorApplicationReleeph/ endpoint and click on the "Install" button then I am presented with a confirmation modal. After clicking "Install" in the modal, I am taken back to the https://phabricator.freelancer.com/applications/view/PhabricatorApplicationReleeph/ URL, but Releeph is still uninstalled.
There are no errors in the PHP error logs.