I have try to install geotrust commercial certificate and i am getting the following error, but with this key and cert my ssl is working fine.

/opt/zimbra/bin/zmcertmgr verifycrt comm commercial.key commercial.crt
** Verifying commercial.crt against commercial.key
Certificate (commercial.crt) and private key (commercial.key) match.
XXXXX ERROR: Invalid Certificate: commercial.crt: /C=US/ST=California/L=Redwood Shores/O=abc Inc/OU=Network/CN=*.abcinc.com
error 20 at 0 depth lookup:unable to get local issuer certificate

Is there any special file permission needed? it is really very urgent.