How to script the guardian effect?

[Shives]

New Problem
main(27,22):ERR : 'S_1' is not declared
The same with the other Objects i want to fade -.-


////////////////////////////
// Run first time starting map
void OnStart()
{
AddEntityCollideCallback("Player", "ScriptArea_1", "Slime", true, 1);
AddEntityCollideCallback("Player", "ScriptArea_2", "Roar", true, 1);
AddEntityCollideCallback("Player", "ScriptArea_3", "S", true, 1);
AddEntityCollideCallback("Player", "ScriptArea_4", "Scare", true, 1);
}
void Slime(string &in asParent, string &in asChild, int alState)
{
PlaySoundAtEntity("", "scare_loon.snt", "Player", 0, false);
AddTimer("", 4, "Wispher");
}
void Wispher(string &in asTimer)
{
PlaySoundAtEntity("", "insanity_imageflash01.snt", "Player", 0, false);
AddTimer("", 7, "Help");
}
void Help(string &in asTimer)
{
PlaySoundAtEntity("", "guardian_distant1.snt", "Player", 0, false);
}
void S(string &in asParent, string &in asChild, int alState)
{
PlaySoundAtEntity("", "guardian_activated.snt", "Player", 0, false);
SetPropActiveAndFade(S_1, true, 0,9);
SetPropActiveAndFade(S_2, true, 0,9);
SetPropActiveAndFade(S_3, true, 0,9);
SetPropActiveAndFade(S_4, true, 0,9);
SetPropActiveAndFade(S_5, true, 0,9);
StartScreenShake(0.9f, 1, 0.9f, 1.0f);
}
void Scare(string &in asParent, string &in asChild, int alState)
{
PlaySoundAtEntity("", "guardian_activated.snt", "Player", 0, false);
SetPropActiveAndFade(P_1, true, 0,9);
SetPropActiveAndFade(P_2, true, 0,9);
SetPropActiveAndFade(P_3, true, 0,9);
SetPropActiveAndFade(P_4, true, 0,9);
SetPropActiveAndFade(P_5, true, 0,9);
SetPropActiveAndFade(P_6, true, 0,9);
StartScreenShake(0.9f, 1, 0.9f, 1.0f);
}
////////////////////////////
// Run when entering map
void OnEnter()
{

}

////////////////////////////
// Run when leaving map
void OnLeave()
{

}