I have to convert deb package to an rpm

@software.opensuse.org/search
I found the repository that contained alien program
by one click I install it

Code:
Information for package alien:

Repository: @System
Name: alien
Version: 8.78-1.9
Arch: noarch
Vendor: obs://build.opensuse.org/openSUSE:Factory
Installed: Yes
Status: up-to-date
Installed Size: 238.0 KiB
Summary: A Perl Script to Convert Packages
Description:
Experimental Perl script to convert software packages. The following
formats are supported: deb (Debian), rpm (Red Hat), and tgz
(Slackware).
when I try to convert it give me an error
Code:
mySRCrepo> sudo alien -r prf.deb
Control file couldn't be read! at
/usr/lib/perl5/vendor_perl/5.10.0/Alien/Package/Deb.pm line 162
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[opensuse:11.2 Milestone 8 | x86-64]
WBR