Your package rubygem-cucumber-rails failed to build from source in current F28. https://koji.fedoraproject.org/koji/taskinfo?taskID=24889558 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
Not sure what was the specific issue, but rubygem-cucumber-rails builds just fine ATM: https://apps.fedoraproject.org/koschei/package/rubygem-cucumber-rails