I am having trouble getting a Comodo cert installed from the GUI or CLI.

Code:
[root@webmail robb]# /opt/zimbra/bin/zmcertmgr verifycrt comm /opt/zimbra/ssl/zimbra/commercial/commercial.key ./commercial.crt ./ca_chain.crt

** Verifying ./commercial.crt against /opt/zimbra/ssl/zimbra/commercial/commercial.key
Certificate (./commercial.crt) and private key (/opt/zimbra/ssl/zimbra/commercial/commercial.key) match.
XXXXX ERROR: Invalid Certificate: ./commercial.crt: /C=US/ST=UT/L=Salt Lake City/O=The USERTRUST Network/OU=http://www.usertrust.com/CN=UTN-USERFirst-Hardware
error 2 at 2 depth lookup:unable to get issuer certificate
I saw a similar issue in the forums and the guy mentioned that he'd chosen "Apache/ModSSL" instead of Tomcat when he submitted the csr. I made the same mistake and asked Comodo about it and they said they only check that for informational purposes, it doesn't affect the certificate generated.

Is there anything else that could be causing this?