Your package python-flask-silk failed to build from source in current F28. https://koji.fedoraproject.org/koji/taskinfo?taskID=24872525 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
Created attachment 1444294 [details] build.log
Created attachment 1444297 [details] root.log
Created attachment 1444299 [details] state.log
Fixed in Rawhide with an update to version 0.2.