14, 46 :error : name not defined within scope?

// Note: You will need to copy both this script and a sound into your object



default
{

    state_entry() {
        llSensorRepeat("", NULL_KEY, AGENT, 5, PI, 5);
    }
    sensor(integer total_number) {

        llPlaySound((string)(++SoundClipNumber),1.0);
        if(ON == 1){llSetTimerEvent(SoundLength); ON = 2;}
        if(SoundClipNumber == MaxSoundClips){llSetTimerEvent(LastSoundLength); ON = 1; SoundClipNumber = 0;}
        llPreloadSound((string)(SoundClipNumber+1));
    }

    listen(integer channel, string name, key id, string message)
    {

        {
            llSetTimerEvent(0.01);
        }
    }
}