Server crash

[Jeus122]

11.08 05:06:58 [Server] Server thread/WARN [minecraft/TileEntity]: Skipping BlockEntity with id 
11.08 05:06:58 [Server] Server thread/ERROR [minecraft/MinecraftServer]: Encountered an unexpected exception
11.08 05:06:58 [Server] INFO java.util.ConcurrentModificationException: null
11.08 05:06:58 [Server] INFO at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445) ~[?:1.8.0_252]
11.08 05:06:58 [Server] INFO at java.util.HashMap$ValueIterator.next(HashMap.java:1474) ~[?:1.8.0_252]
11.08 05:06:58 [Server] INFO at net.minecraft.world.World.func_147448_a(World.java:1949) ~[amu.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:856) ~[axw.class:?]
11.08 05:06:58 [Server] INFO at net.minecraftforge.common.chunkio.ChunkIOProvider.syncCallback(ChunkIOProvider.java:109) ~[ChunkIOProvider.class:?]
11.08 05:06:58 [Server] INFO at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:94) ~[ChunkIOExecutor.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:118) ~[on.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.func_186028_c(ChunkProviderServer.java:89) ~[on.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:135) ~[on.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.World.func_72964_e(World.java:310) ~[amu.class:?]
11.08 05:06:58 [Server] INFO at com.teamwizardry.wizardry.api.block.TileCachable.onLoad(TileCachable.java:39) ~[TileCachable.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.World.func_175700_a(World.java:1924) ~[amu.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.World.func_147448_a(World.java:1951) ~[amu.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:856) ~[axw.class:?]
11.08 05:06:58 [Server] INFO at net.minecraftforge.common.chunkio.ChunkIOProvider.syncCallback(ChunkIOProvider.java:109) ~[ChunkIOProvider.class:?]
11.08 05:06:58 [Server] INFO at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:94) ~[ChunkIOExecutor.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:118) ~[on.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.func_186028_c(ChunkProviderServer.java:89) ~[on.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:135) ~[on.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.World.func_72964_e(World.java:310) ~[amu.class:?]
11.08 05:06:58 [Server] INFO at com.teamwizardry.wizardry.api.block.TileCachable.onLoad(TileCachable.java:39) ~[TileCachable.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.World.func_175700_a(World.java:1924) ~[amu.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.World.func_147448_a(World.java:1951) ~[amu.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:856) ~[axw.class:?]
11.08 05:06:58 [Server] INFO at net.minecraftforge.common.chunkio.ChunkIOProvider.syncCallback(ChunkIOProvider.java:109) ~[ChunkIOProvider.class:?]
11.08 05:06:58 [Server] INFO at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:94) ~[ChunkIOExecutor.class:?]
11.08 05:06:58 [Server] INFO at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:118) ~[on.class:?]
11.08 05:06:59 [Multicraft] Server shut down (running)

 

Server is on a crash loop everytime someone logs in

[Danebi]

Post logs/debug.log.