ClassiCube

Im trying to fully modefy the mojang server jar so that it can run on classicube with no issue. It runs fine at first:

 17:07:40  Setting up
 17:07:40  Loading level
 17:07:41  Now accepting input on 25565
 17:07:41  Level saved! Load: 0/16
 17:07:41  To connect directly to this server, surf to: http://www.classicube.net/server/play/cdb13b726257d5215f3387ee99c58b98/
 17:07:41  (This is also in externalurl.txt)

Untill: 17:07:49 /127.0.0.1 connected

There it goes.

Exception in thread "Thread-2" java.lang.Error: Unresolved compilation problems: o cannot be resolved or is not a field Cannot invoke c(float) on the primitive type boolean j cannot be resolved or is not a field m cannot be resolved or is not a field l cannot be resolved or is not a field k cannot be resolved or is not a field d cannot be resolved or is not a field e cannot be resolved or is not a field f cannot be resolved or is not a field i cannot be resolved or is not a field i cannot be resolved or is not a field o cannot be resolved or is not a field i cannot be resolved or is not a field com.mojang.minecraft.a.a cannot be resolved to a type com.mojang.minecraft.a.a cannot be resolved to a type

at com.mojang.minecraft.net.PlayerConnection.a(PlayerConnection.java:86)
at com.mojang.minecraft.server.MinecraftServer.c(MinecraftServer.java:274)
at com.mojang.minecraft.server.MinecraftServer.run(MinecraftServer.java:206)
at java.lang.Thread.run(Unknown Source)

I just cant figure out the issue. Eclipse said there is no problems, only some warning, but they never break anything and this ONLY happens when someone joins! Please help! If you need the entire source, I will give it to you.