dear mladen, i have always the same problem with EMPTY_VALUE, Im trying to call the buffers of this indicators but dont work, whats wrong?

Thanks soo much,

double Coral(int i)
{
double up = iCustom(NULL,0,"Coral",1,i)!=EMPTY_VALUE;
double dn = iCustom(NULL,0,"Coral",2,i)!=EMPTY_VALUE;

if(up)
{
return(1);
}
if(dn)
{
return(-1);
}

return(0);
}