Development Assistance set random loot for dropper [survival games]

i want to set special loot for sg in a dropper , but i get this error. read file i have added.
i'm running craftbukkit 1.8
java 8 update 25
4.0 gb
with more plugins

i have modifed the plugin http://dev.bukkit.org/bukkit-plugins/survival-games/
https://github.com/Double0negative/Survival-Games/tree/master/src/main/java/org/mcsg/survivalgames
i have copy everything for the droppers from chestreplaceevent.java, chestratiostorage.java and chestratiostorageOLD,java. i have everything changed to dropper. but it will not work.
everything works only the droppers not.
i have also the full plugin in a zip map added.

i hope you guys will help me.

sorry for the bad english i'm dutch

 

@King_Horse You will produce better grammar if you speak Dutch into Google Translate than if you try to speak English. Also, I'm pretty sure we can't help you if you're modifying an existing plugin.

 

Thanks for the comment. Yes,i'm modifying an existing plugin. And Thanks for the tip.