Classpath issue


i added a new folder in my Menu : Edit->Preferences->ActionScript->ActionScript 3.0 settings.

i clicked on + and set my new folder where i have a package as following :


i clicked OK (to close Classpath window) and once again OK to close Preference window.
i test again my code and i get always the same issue :

1172: Definition rogtek.graphic.effects:Mosaic could not be found.
at my code line : import rogtek.graphic.effects.Mosaic;

my package is define as following :

package rogtek.graphic.effects
    public class Mosaic
        public function Mosaic(xPos:Number, yPos:Number, nWidth:Number, nHeight:Number)
           // blah blah blah

so where did i do a mistake ?