[CentOS] kernel panic on 5.6

Ok - after further looking - I have found this in /root/install.log

error: nash-5.1.19.6-68.el5_61: Header V3 DSA signature BAD, key ID e8562897

I am using a local repo for installations:

In my updates directory nash shows as ls -l nash*
-rw-r--r-- 1 537 537 1177729 Apr 14 9:52 nash-5.1.19.6-68.el5_6.1.x86_64.rpm

Is this file corrupt? 
I can always just remove it and try again. however I'd like to know what 
happened
so it doesnt again.

Any thoughts? Thanks!

Jerry