[amibroker] What is wrong with this code

[zeek ing]

Can anyone tell me why this code won't produce a sigscaleout in an
exploration?.  I thought I had the right code. I guess i Don't.
thanks

Buy= conditon1 AND (H>highsignal);
BuyPrice = Max(O,Highsignal+.05);

Sell= Low<=TrailingStop;
SellPrice = TrailingStop;

Buy =  IIf( Buy == sigScaleOut, Buy, ExRem( Buy, Sell ) );
Buy = IIf( High>=(BuyPrice+FirstProfitTarget), sigScaleOut, Buy );