Error on server

[xxx_rayne_xxx]

Hello I have a server.pro server but since I added mods it wont start and comes up with this big error that I don't know what it means. Help Please?

[ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception

java.lang.IllegalArgumentException: ChunkNibbleArrays should be 2048 bytes not: 0

at net.minecraft.world.chunk.NibbleArray.<init>(SourceFile:16) ~[axs.class:?]

at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75823_a(AnvilChunkLoader.java:450) ~[aye.class:?]

at net.minecraft.world.chunk.storage.AnvilChunkLoader.checkedReadChunkFromNBT__Async(AnvilChunkLoader.java:129) ~[aye.class:?]

at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:93) ~[aye.class:?]

at net.minecraftforge.common.chunkio.ChunkIOProvider.run(ChunkIOProvider.java:70) ~[ChunkIOProvider.class:?]

at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:92) ~[ChunkIOExecutor.class:?]

at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:118) ~[on.class:?]

at net.minecraft.world.gen.ChunkProviderServer.func_186028_c(ChunkProviderServer.java:89) ~[on.class:?]

at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:135) ~[on.class:?]

at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:344) ~[MinecraftServer.class:?]

at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:314) ~[MinecraftServer.class:?]

at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:270) ~[nz.class:?]

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) [MinecraftServer.class:?]

at java.lang.Thread.run(Thread.java:813) [?:1.8.0_212]