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I attempted to add fastcraft to the server today, as the users have been complaining about lag, and when I rebooted the server, I got this crash report, and the issue persists, even after removing fastcraft. Seems like a Java error? The server had been up for several days, so It could've been something that updated, but I'm not sure, and would like another pair of eyes on the crash file. If I need to post something else, please tell me.

[21:42:46] [Server thread/INFO]: Starting minecraft server version 1.7.10
[21:43:02] [Server thread/INFO]: Loading properties
[21:43:02] [Server thread/INFO]: Default game type: SURVIVAL
[21:43:02] [Server thread/INFO]: Generating keypair
[21:43:02] [Server thread/INFO]: Starting Minecraft server on *:25565
[21:43:10] [Server thread/INFO]: Preparing level "Oi"
[21:43:24] [Server thread/INFO]: Preparing start region for level 0
[21:43:24] [Server thread/INFO]: Done (14.543s)! For help, type "help" or "?"
[21:43:26] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.util.ReportedException: Exception ticking world
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:631) ~[MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) ~[lt.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) ~[MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]
Caused by: java.lang.ArrayIndexOutOfBoundsException: 3056
at net.minecraft.world.chunk.NibbleArray.func_76582_a(SourceFile:26) ~[apv.class:?]
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.func_76665_b(SourceFile:75) ~[apz.class:?]
at net.minecraft.world.chunk.Chunk.func_76628_c(Chunk.java:548) ~[apx.class:?]
at net.minecraft.world.chunk.Chunk.func_150812_a(Chunk.java:878) ~[apx.class:?]
at net.minecraft.world.chunk.Chunk.func_150813_a(Chunk.java:862) ~[apx.class:?]
at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadEntities(AnvilChunkLoader.java:500) ~[aqk.class:?]
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:41) ~[ChunkIOProvider.class:?]
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12) ~[ChunkIOProvider.class:?]
at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344) ~[AsynchronousExecutor.class:?]
at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302) ~[AsynchronousExecutor.class:?]
at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12) ~[ChunkIOExecutor.class:?]
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:126) ~[ms.class:?]
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101) ~[ms.class:?]
at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:199) ~[ms.class:?]
at net.minecraft.world.World.func_72964_e(World.java:419) ~[ahb.class:?]
at net.minecraft.world.WorldServer.func_147456_g(WorldServer.java:313) ~[mt.class:?]
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:183) ~[mt.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:625) ~[MinecraftServer.class:?]
... 4 more
[21:43:26] [Server thread/ERROR]: This crash report has been saved to: C:\Servers\Minecraft\Custom\.\crash-reports\crash-2017-02-08_21.43.26-server.txt
[21:43:26] [Server thread/INFO]: Stopping server
[21:43:26] [Server thread/INFO]: Saving players
[21:43:26] [Server thread/INFO]: Saving worlds
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Overworld
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Nether
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/The End
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Underdark
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Soul Network Dimension
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Spirit World
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Torment
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Mirror
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Wyvern Lair
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/The Outer Lands
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/The Last Millenium
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Twilight Forest
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Dungeons
[21:43:26] [Server thread/INFO]: Saving chunks for level 'Oi'/Aether

i dont think that mod is compatible with servers

According to the mod description it is:

"The mod is optional on both server and client, meaning that it can be installed on both server and client, just the client or just the server. Even mismatched versions between server and client are fine. It is recommended to always use the latest version on both sides however."

And I tried removing it from the server already, which is what makes me think a mod, or possibly something on the server PC updated.

yea. does your server work if you take the mod out?

It does not, get the same error code, so I'm pretty sure it is something else. I deleted the .jar and the .ini from the from the configuration file. I think that is everything the mod leaves.

I've narrowed it down to the world file, I put in a world backup, and the server launched, but unfortunately the last backup was the 1st, and a lot of stuff would be lost, so I was wondering if anyone knows what fastcraft would change in the world file.