freeradius server not running

[peter]

Hi List members

With ssh-keygen I have created -with password- server.pem and ca.pem. 
Moved them to /etc/raddb/certs.

but now I've got the following errors:

tls: Failed reading certificate file "/etc/raddb/certs/server.pem"

tls: error:0906D06C:PEM routines:PEM_read_bio:no start line tls: 
error:140DC009:SSL routines:use_certificate_chain_file:PEM lib 
rlm_eap_tls: Failed initializing SSL context rlm_eap (EAP): Failed to 
initialise rlm_eap_tls /etc/raddb/mods-enabled/eap[14]: Instantiation 
failed for module "eap"

Please bear in mind I am new here and this is the first time I going to 
use freeradius. A little patience is highly appreciated.

What is recommended to solve this problem?

Thanks in advance

Peter