Keytool Error: DER Value Conversion

I'm trying to import a certificate into a Keystore and I keep getting the following error:

Keytool error: java.lang.IllegalArgumentException: DER value conversion

I'm running this on a W2K3 box with Java SDK 1.4.2. I have imported this certificate on two other servers that have the same configuration with no problems. I've been trying to fix this thing for days and it has become very frustrating.