Unable to process private key

[Erinn Looney-Triggs]

I am receiving the following error when trying to use gnutls-cli:

gnutls-cli --x509cafile /etc/pki/certmaster/ca.cert --x509keyfile
foo.example.com.pem --x509certfile foo.example.com.cert -p 514
bar.example.com
Processed 1 CA certificate(s).
Processed 1 client certificates...
*** Error loading key file: Base64 decoding error.

I am able to successfully render the private key using openssl:

openssl rsa -noout -text -in <key>

Is their an equivalent command for gnutls?

However, I am unsure of what the problem with the key is that I am
looking for, any guidance would be greatly appreciated.

This is gnutls-2.8.5-4.el6.x86_64 on a RHEL 6 system.

Thanks,
-Erinn