Nagios：联系人配置问题

最近配置了Nagios监控，检查配置文件都没问题，但是一直有这个个警告：Host 'linux' has no default contacts or contactgroups defined!
以下是相关配置文件
contacts.cfg

 define contact{
        contact_name                    wuen             ; Short name of user
        use                             generic-contact         ; Inherit default values from generic-contact template (defined above)
        alias                           Nagios wuen            ; Full name of user

        email                           nagios@localhost        ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
        }


define contactgroup{
        contactgroup_name       adminstrator
        alias                   Nagios Administrator
        members                 wuen
        }

services.cfg

 define service {
        host_name        redhat6.6-linux  
        service_description   check-host-alive
        check_period          24x7
        max_check_attempts    4
        check_interval 3
        retry_interval  2
        contact_groups          adminstrator     
        notification_interval   10
        notification_period     24x7
        notification_options    w,u,c,r
        check_command           check-host-alive  ;检查主机是否存活
        }

求大神们帮忙看看那里出问题了。