Installation of certificate failed

[mathayo]

Hi Team
I tried to check from different forums and followed all the step to deploy the certificate
1. I generated the CSR and copied the csr key and submited to the CA
2. Today i received the certificate
certificate:
Root/Intermediate(s) only:
Intermediate(s)/Root only:
Other format
certificate:

After that, i created nano commercial.crt in /tmp folder and paste intermediate and saved
Also i created nano commercial_ca.crt in /tmp copying certificate and rootCA certificate to the file created

After that i implemented this command under zimbra user
/opt/zimbra/bin/zmcertmgr deploycrt comm /tmp/commercial.crt /tmp/commercial_ca.crt
But i am getting this error
** Verifying '/tmp/commercial.crt' against '/opt/zimbra/ssl/zimbra/commercial/commercial.key'
unable to load certificate
140230875510448:error:0906D06CEM routinesEM_read_bio:no start line:pem_lib.c:707:Expecting: TRUSTED CERTIFICATE
ERROR: Certificate '/tmp/commercial.crt' and private key '/opt/zimbra/ssl/zimbra/commercial/commercial.key' do not match.


What wrong with this step and how can i fix