Trails Error

[20:50:52 ERROR]: Could not pass event PlayerMoveEvent to LobbySystem v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:297) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:242) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at net.minecraft.server.v1_8_R1.PacketPlayInFlying.a(SourceFile:126) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at net.minecraft.server.v1_8_R1.PacketPlayInPosition.a(SourceFile:57) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_74]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_74]
        at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:656) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:284) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:609) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:517) [craftbukkit-1.8.jar:git-Bukkit-7019900]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_74]
Caused by: java.lang.NoSuchFieldError: WATERDRIP
        at de.ls.main.LobbyItems.onTrailMove(LobbyItems.java:934) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_74]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_74]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:295) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
        ... 14 more