alien conversion from deb to rpm on fedora 27

I find myself unable to convert a .deb package to .rpm to install it on fedora. I am not able to download the equivalent rpm file, so conversion is my only way out. I get this error after using the prompt alien -r package.deb as su. Package build failed. Here's the log of the command (cd shadow-beta-0.8.62; rpmbuild --buildroot='/home/user/shadow/shadow-alpha-artful(1)/shadow-beta-0.8.62' -bb --target x86_64 'shadow-beta-0.8.62-2.spec'): Fehler: Zeile 5: Leerer Tag: Summary: Für folgende Zielplattform(en) wird gebaut: x86_64 Edit: I am unable to follow the suggestions in the answers. How can I edit a file that is not even generated because the conversion failed?