Hi to everyone.
I have a Zimbra 7 installation and I would to install a certificate issued by RapidSSL.
I followed this official guide ( Installing a RapidSSL Commercial Certificate - Zimbra :: Wiki ) but when I run
# ./zmcertmgr deploycrt comm /tmp/server.crt /tmp/ca_bundle.crt
I obtain this output:

Certificate (/root/cert/server.crt) and private key (/opt/zimbra/ssl/zimbra/commercial/commercial.key) match.
Valid Certificate: /root/cert/server.crt: OK
** Copying /root/cert/server.crt to /opt/zimbra/ssl/zimbra/commercial/commercial.crt
** Appending ca chain /root/cert/ca_bundle.crt to /opt/zimbra/ssl/zimbra/commercial/commercial.crt
** Importing certificate /opt/zimbra/ssl/zimbra/commercial/commercial_ca.crt to CACERTS as zcs-user-commercial_ca...failed.
XXXXX ERROR: failed to import certficate.

I try to find some solution on Google, but I did'nt find.
Anyone can help to solve this problem?