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Hi Mike,

Try with this:

rule "Free Fish Food Sample"

    agenda-group "evaluate"

    dialect "mvel"

    when

        $order : Order()

        not ( $p : Product( name == "Fish Food") && Purchase( product == $p ))

        not ( $p : Product( name == "Fish Food Sample") && Purchase( product == $p ) )       

        exists ( $p : Product( name == "Gold Fish") && Purchase( product == $p ) )   

        $fishFoodSample : Product( name == "Fish Food Sample" )

    then

        System.out.println( "Adding free Fish Food Sample to cart" );

        purchase = new Purchase($order, $fishFoodSample);

        insert( purchase );

        $order.addItem( purchase );   

end

I've added 1 closing parenthesis ) and I remove the ; in the last condition in the when part.

Greetings