in MT4, Error: Array out of Range in .... line: retval = Time[0];

public: /* The main method */
datetime _execute_()
{
         ...
	else if (ModeTime == 3)
	{
		ArraySetAsSeries(Time,true);
		CopyTime(TimeMarket,TimeCandleTimeframe,TimeCandleID,1,Time);
		retval = Time[0];
	}