[PlanetCCRMA] Invalid signature

[Len]

Hi,
I recently installed Fedora 21 on a new system. After installing the planetccrma core packages, attempting to boot the realtime kernel gives the following:
  error: /vmlinux-3.18.9-201.rt5.1.fc21.ccrma.x86_64+rt has invalid signature.  error: you need to load the kernel first.
  Press any key to continue...
Has anyone else seen this, or know what causes it?
Thanks,Len
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