High Five Rune drop cast to CB

[oRiGiNaL]

I create drop rune. And i want to display drop rate on community board.
I make method on Item.java but CB doesn;t see as merhod and give me red line.

Here it is method form Item.java

   public double getdropBonusMod()
   {
      return _dropBonusModifier;
   }

And here screenshot with error.

https://ibb.co/51TmVSL