error: skipping package with unverifiable V4 signature

[Minnikhanov]

   Hi. I create my rpm & sign it.
     rpmbuild --sign -ba rubygem-launchy.spec
  
      Sign-key create by 'seahorse'. 
  Import it -> su -c 'rpm --import /var/key/mykey.asc'
        '.rpmmacros' was filled.
  
      Can't install:
       [pkg at lhost noarch]$ su -c 'rpm -ivh *-launchy-*.rpm'
       Password:
       error: skipping package with unverifiable V4 signature
      error: rubygem-launchy-0.3.7-1.fc14.noarch.rpm cannot be installed
       [pkg at lhost noarch]$

      Early I do that, at f10, may be on f12. 
      What is wrong now, advice me, please.

[pkg at lhost ~]$ uname -r
2.6.35.6-48.fc14.x86_64

I ask on IRC #fedora & #fedora-devel - was routed here.

Best regards.