Centos 7 mondo install fails due to bad key

I'm trying to install mondo on  Centos 7.  I've setup the mondo repository
and when that failed, also added afio, pb, and buffer repos

yum install 
results in the following errors:
...
Downloading packages:
warning:
/var/cache/yum/x86_64/7/afio/packages/perl-ProjectBuilder-0.14.5-1.rhel7.noa
rch.rpm: Header V4 RSA/SHA512 Signature, key ID 20ebfb0e: NOKEY
Retrieving key from ftp://ftp.project-builder.org//rhel/7/x86_64/afio.pubkey


The GPG keys listed for the "rhel 7 x86_64 - afio Vanilla Packages"
repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.


 Failing package is: perl-ProjectBuilder-0.14.5-1.rhel7.noarch
 GPG Keys are configured as:
ftp://ftp.project-builder.org//rhel/7/x86_64/afio.pubkey


HELP




------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot