Error: Could not expand services specified in service escala

I have a file defining multiple hosts:

define host{
use generic-host
host_name myhost.mydomain.com
alias myhost
address 10.80.16.30
hostgroups CommonChecks
notifications_enabled 1
}
define host{
...
}

The services are being properly added to the hosts via the defined hostrgoup, but when I try to define service escalations I get :

[quote]Error: Could not expand services specified in service escalation (config file ‘/usr/local/nagios/etc/objects/serviceescalations.cfg’, starting on line 11)
Error processing object config files![/quote]

The serviceescalations.cfg looks like:

define serviceescalation{
        use escalate-level2
        host_name myhost.mydomain.com
        service_description *
        }
define serviceescalation{
        use escalate-level2
        host_name myhost2.mydomain.com
        service_description *
        }

Checks, hostescalations, etc are all working - but serviceescalations just won’t load. Any suggestions?