SSL Certificate error - re-configuring to new domain

[mfaisal1]

I have purchased an SSL certificate from Godaddy and install it on Zimbra email server which hostname is email.stp.net.pk. Then I have created a second email domain on it i.e. pseb.org.pk. and set it as default domain. Now I wanted to apply the SSL certificate to second domain for which I have applied on Godaddy.com to change the domain and they have provided me two new certificate files but it is giving following error when I try to install them on  Zimbra server:
Your certificate was not installed due to the error : system failure: exception executing command: zmcertmgr verifycrtkey comm /opt/zimbra/mailboxd/webapps/zimbraAdmin/tmp/current_comm.key /opt/zimbra/mailboxd/webapps/zimbraAdmin/tmp/current.crt with {RemoteManager: email.stp.net.pk->zimbra@email.stp.net.pk:22}
Need your kind help to install this SSL certificate on second domain.
Thanks