Bolinger band with stockastic

buy

CLOSE < BBB(CLOSE, 20, 2, EXPONENTIAL) AND crossover(SOPD(20,3,4,SIMPLE),sma(close,20))

sell,

CLOSE > BBT(CLOSE, 20, 2, EXPONENTIAL) AND crossover(sma(close,80),SOPD(20,3,4,SIMPLE))

sir, code is correct but when back testing why error is coming please help me to correct for back testing

The above code is correct change the values and try with high volume scripts with large historical data