No trades

[texasnomad]

If I use this code the strategy places a trade.

        protected override void OnBarUpdate()
        {
           if (ParabolicSAR(0.02, 0.2, 0.02)[1] > Close[1]
                && ParabolicSAR(0.02, 0.2, 0.02)[0] < Close[0]
                && Position.MarketPosition == MarketPosition.Flat)
            {
                EnterLong(Lots, "");
            }
        }

If I use this code, no trades enter. What's wrong here?

protected override void OnBarUpdate()
        {
            double atr, stop;
            
            if (ParabolicSAR(0.02, 0.2, 0.02)[1] > Close[1]
                && ParabolicSAR(0.02, 0.2, 0.02)[0] < Close[0]
                && Position.MarketPosition == MarketPosition.Flat)
            {
                EnterLong(Lots, "");
                sdev = CalculateSDev(SDEV_LOOKBACK);
                atr = ATR(14)[1] * ATR_MULTIPLIER;
                stop = Close[0] - atr;
             }
          }