[amibroker] missing short cover variable assignments

[vivek.kumar-bhat@xxxxxxxxxxxxxxxxxxxxxxxx]

HI all

i was trying to backtest the EMA band fromula as attached below which i had picked up from the library. how ever i am getting the error mesage as "
missing short cover variable assignments " when i an trying for the short side. can some one guide me as to where am i going wrong or what should i do
to rectify the same

thanx

               /* EMA offset bands ver 1_2
I'd guess this is NOT much different to bbands except you can contol the per % offset and the periods ema to off set*/
per=.10;//Percent placement
periods=20;//time periods
/*********************************/

emaverage= EMA(C,periods);
bandsAdjust=emaverage*per;

upperband=emaverage+bandsAdjust;
Lowerband=emaverage-bandsAdjust;
Plot(EMA(C,periods),"ema",5,1);
Plot(C,"EMA",15,64);// plots the close with candles
Plot(upperband,"upperband",3,1);// upperband
Plot(Lowerband,"lowerband",4,1);//lowerband

bCond1=Ref(Cross(C,Lowerband),-1) AND C > lowerband ;
bCond2= C > EMAverage ;// the "or" gets me into up trends
bCond3= C > EMA(C,65);// trend

Buy = bcond1 AND bCond3 OR bCond2;

scond1= Ref( Cross(emaverage,C),-1)AND C < emaverage;// close days under ema
scond2=C < Lowerband;//failed trade drops below lowerband
Sell = scond1 OR scond2;

Buy = ExRem( Buy, Sell );// removes buy/sell arrows
Sell = ExRem( Sell, Buy );

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