[amibroker] How to save to WatchList from Analysis Exploration

[umrperumal]

Hi knowledgeable members,

I want to save the results of the following exploration to watch 
list.   But when I run the exploration, I get the results displayed 
in the AA window, but it is not saved to the watch list.

Can any one say what is the mistake in the following code? 


WLN = 10 ;     // Watch List number
        
AvgVolume = MA(V,50) ;
AvgValue  = (AvgVolume * C) / 10000000 ;

AddColumn(AvgValue, "AvgValue",1.2) ;
Filter = AvgValue > 250 ;

if(LastValue(Filter))
CategoryAddSymbol( "HighVolStocks", categoryWatchlist, WLN );

With advance thanks

perumal