Troubles with logging into my server

[ZCYCS]

Hi there

So I've created a Tekkit server for my friends and I but suddenly none of us can join despite the server working this morning and weeks before

I've tried and I keep getting the following messages at the bottom of the launch file:

16:54:06 [sEVERE] java.lang.ClassCastException: net.minecraft.server.NBTTagEnd c

annot be cast to net.minecraft.server.NBTTagCompound

16:54:06 [sEVERE] at codechicken.enderstorage.EnderStorageManager$EnderSto

rageInv.loadItems(EnderStorageManager.java:247)

16:54:06 [sEVERE] at codechicken.enderstorage.EnderStorageManager$EnderSto

rageInv.<init>(EnderStorageManager.java:228)

16:54:06 [sEVERE] at codechicken.enderstorage.EnderStorageManager.getStora

ge(EnderStorageManager.java:118)

16:54:06 [sEVERE] at codechicken.enderstorage.TileEnderChest.q_(TileEnderC

hest.java:66)

16:54:06 [sEVERE] at net.minecraft.server.World.tickEntities(World.java:11

90)

16:54:06 [sEVERE] at net.minecraft.server.MinecraftServer.w(MinecraftServe

r.java:569)

16:54:06 [sEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftSer

ver.java:467)

16:54:06 [sEVERE] at net.minecraft.server.ThreadServerApplication.run(Sour

ceFile:492)

16:54:06 [sEVERE] Unexpected exception

java.lang.ClassCastException: net.minecraft.server.NBTTagEnd cannot be cast to n

et.minecraft.server.NBTTagCompound

at codechicken.enderstorage.EnderStorageManager$EnderStorageInv.loadItem

s(EnderStorageManager.java:247)

at codechicken.enderstorage.EnderStorageManager$EnderStorageInv.<init>(E

nderStorageManager.java:228)

at codechicken.enderstorage.EnderStorageManager.getStorage(EnderStorageM

anager.java:118)

at codechicken.enderstorage.TileEnderChest.q_(TileEnderChest.java:66)

at net.minecraft.server.World.tickEntities(World.java:1190)

at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:569)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

>

If anyone has any clue as to what I should do now, I'd appreciate it. Thanks