Lost signal is backtest

Here is My Simple AFL, just two MA cross

SetPositionSize( 1 , spsShares ) ;		//每個信號下一口單

FastMAs = Param("FaseMA", 3, 3, 30, 1);
SlowMAs = Param("SlowMA", 20, 8, 40, 1);

FastMA = MA(C, FastMAs);
SlowMA = MA(C, SlowMAs);

Buy = Cross(FastMA, SlowMA);
Sell = Cross(SlowMA, FastMA);

Short = Sell;
Cover = Buy;

Plot(FastMA , "FastMA", colorBlue , styleLine ) ; 
Plot(SlowMA , "SlowMA", colorYellow , styleLine ) ; 

PlotShapes(Buy * shapeUpTriangle, colorBlue, 0, L, -10);

PlotShapes(Sell * shapeDownTriangle, colorOrange, 0, H, -10);

Plot( C , "Close" , colorDefault , styleCandle );

but in BackTest , i lost some trade like this
ABErr0004

lost some trade , how to check it

Read link below, might help

http://www.amibroker.com/kb/2014/11/10/troubleshooting-procedure-when-backtest-shows-no-trades/

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