grab update error

I'm grabbing packages after a stock RH-9.0 installation. grab appears to
be choking on the updates. see error below.
running grab with the redownload doesn't make a difference.

has anyone seen this error before?



************************snip error from
grab*************************************
-You selected 7.4M of archives
 ->Do you want to continue? [Y/n]: y
-Grabbing the selected packages...
 (1/3) compat-gcc-g77-7.3-2.96.118.i386.rpm                             
1415kB
 (2/3) gcc-3.2.2-5.i386.rpm                                             
4412kB
 (3/3) gcc-g77-3.2.2-5.i386.rpm
-Checking the signature of the cached RPM(s)
rpmk: no arguments given
 -> ERROR:
rpmk: no arguments given
 -> ERROR:
rpmk: no arguments given
 -> ERROR:
-Some RPM(s) failed to validate
-You may wish to try re-invoking grab with the '--redownload' option
-Calling 'rpm -Uvh' for '3' package(s)
error: open of #rpm failed: No such file or directory
error: open of opts# failed: No such file or directory
warning: /var/cache/grab/RPMS/compat-gcc-g77-7.3-2.96.118.i386.rpm: V3
DSA signature: NOKEY, key ID db42a60e
-RPM had a non-zero exit code, not erasing downloaded RPMS

************************snip error from
grab*************************************