Your package erlang-proper failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17714804 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1251987 [details] build.log
Created attachment 1251988 [details] root.log
Created attachment 1251989 [details] state.log
bowlofeggs's erlang-proper-1.2-3.fc26 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=860310