AttachObjectToVehicle Frage need help

so is mein code:
if(!strcmp(cmdtext,"/flashon",true))
{
new myobject = CreateObject(19419,0,0,-1000,0,0,0,100);
AttachObjectToVehicle(myobject, GetPlayerVehicleID(playerid), 0.000000,0.150000,0.749999,0.000000,0.000000,0.000000);
AttachObjectToVehicle(myobject, GetPlayerVehicleID(playerid), 1.575000,0.524999,-1.125000,0.000000,0.000000,89.099983);
AttachObjectToVehicle(myobject, GetPlayerVehicleID(playerid), -1.575000,0.599999,-1.125000,0.000000,0.000000,89.099983);
AttachObjectToVehicle(myobject, GetPlayerVehicleID(playerid), 0.000000,2.775001,-0.974999,0.000000,0.000000,0.000000);
return 1;
}

if(!strcmp(cmdtext,"/flashoff",true))
{
new myobject = CreateObject(19419,0,0,-1000,0,0,0,100);
DestroyObject(myobject);
return 1;
}

wenn ich jetzt ingame /flashon eingebe kommt nur ein Object von 4 warum HELP

und wenn ich /flashoff mache geht das auch nicht weg HELP

was mache ich falsch ????

soll ich das also so machen ?
if(!strcmp(cmdtext,"/flashon",true))
{
new myobject = CreateObject(19419,0,0,-1000,0,0,0,100);
new myobject = CreateObject(19419,0,0,-1000,0,0,0,100);
new myobject = CreateObject(19419,0,0,-1000,0,0,0,100);
new myobject = CreateObject(19419,0,0,-1000,0,0,0,100);
AttachObjectToVehicle(myobject, GetPlayerVehicleID(playerid), 0.000000,0.150000,0.749999,0.000000,0.000000,0.000000);
AttachObjectToVehicle(myobject, GetPlayerVehicleID(playerid), 1.575000,0.524999,-1.125000,0.000000,0.000000,89.099983);
AttachObjectToVehicle(myobject, GetPlayerVehicleID(playerid), -1.575000,0.599999,-1.125000,0.000000,0.000000,89.099983);
AttachObjectToVehicle(myobject, GetPlayerVehicleID(playerid), 0.000000,2.775001,-0.974999,0.000000,0.000000,0.000000);
return 1;
}

dann krieg ich aber errors

error 021: symbol already defined: "myobject"

so ?
if(!strcmp(cmdtext,"/flashon",true))
{
new myobject [4] = CreateObject(19419,0,0,-1000,0,0,0,100);
AttachObjectToVehicle(myobject[0], GetPlayerVehicleID(playerid), 0.000000,0.150000,0.749999,0.000000,0.000000,0.000000);
AttachObjectToVehicle(myobject[1], GetPlayerVehicleID(playerid), 1.575000,0.524999,-1.125000,0.000000,0.000000,89.099983);
AttachObjectToVehicle(myobject[2], GetPlayerVehicleID(playerid), -1.575000,0.599999,-1.125000,0.000000,0.000000,89.099983);
AttachObjectToVehicle(myobject[3], GetPlayerVehicleID(playerid), 0.000000,2.775001,-0.974999,0.000000,0.000000,0.000000);
return 1;
}

krieg ich aber nen error:
error 008: must be a constant expression; assumed zero

und wie help pls

if(!strcmp(cmdtext,"/flashon",true))
{
new sirene[4];
sirene[0] = CreateObject(19419,0,0,-1000,0,0,0,100);
sirene[1] = CreateObject(19419,0,0,-1000,0,0,0,100);
sirene[2] = CreateObject(19419,0,0,-1000,0,0,0,100);
sirene[3] = CreateObject(19419,0,0,-1000,0,0,0,100);

AttachObjectToVehicle(sirene[0], GetPlayerVehicleID(playerid), 0.000000,0.150000,0.749999,0.000000,0.000000,0.000000);
AttachObjectToVehicle(sirene[1], GetPlayerVehicleID(playerid), 1.575000,0.524999,-1.125000,0.000000,0.000000,89.099983);
AttachObjectToVehicle(sirene[2], GetPlayerVehicleID(playerid), -1.575000,0.599999,-1.125000,0.000000,0.000000,89.099983);
AttachObjectToVehicle(sirene[3], GetPlayerVehicleID(playerid), 0.000000,2.775001,-0.974999,0.000000,0.000000,0.000000);
return 1;
}

if(!strcmp(cmdtext,"/flashoff",true))
{
DestroyObject(sirene);
return 1;
}

errors:
error 017: undefined symbol "sirene"

hä xD

kannst du mir bitte sagen wie

das problem undefinied symbol ist ja nur deswegen:

if(!strcmp(cmdtext,"/flashoff",true))
{
DestroyObject(myobject);
return 1;
}

das könnte ich auch weglassen aber ich will die objekte hin und weg machen können

wenn ich oben nochmal new myobject; mache kommen viele loose indentia oder so xD

aber das eine stört mich
warning 219: local variable "myobject" shadows a variable at a preceding level

was bedeutet das