dsdtnt - 2007-02-07

I get this error when I try to write my config for check_nt:
Error :Service check command 'check-nt-cpuload' specified in service 'check-nt-cpulaod' for host 'name' not defined anywhere!
Now I've created many check commands and they all work great, I've checked the service.cfg, command.cfg and checkcommand.cfg and all files look ok.
What am I missing ?
Some help please....Thanks