devassistant.appdata.xml is licensed as CC-BY-SA. You need to put that to License tag as well. See https://lists.fedoraproject.org/pipermail/legal/2013-September/002251.html
devassistant-0.8.0-3.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/devassistant-0.8.0-3.fc20
Package devassistant-0.8.0-3.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing devassistant-0.8.0-3.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-5093/devassistant-0.8.0-3.fc20 then log in and leave karma (feedback).
devassistant-0.8.0-3.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.