[amibroker] CategoryGetSymbols doesn't accept a string as first parameter

["Paolo Cavatore" <pcavatore@xxxxxxxxx>]

I'd like to be able to choose my symbols universe with parameters but 
CategoryGetSymbols function doesn't accept a string as first parameter 
(see code below).

Universe1 = ParamList("Universe 
Category", "categoryMarket|categoryGroup|categorySector|categoryIndustry
|categoryWatchlist|categoryFavorite|categoryIndex", 1);
Universe2 = Param("Universe Index", 0, 0, 255, 1);
list = CategoryGetSymbols(Universe1, Universe2);

Any suggestions?

regards,

paolo


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