gamerfreak2500

I am running a small private server but when i try to place a chunckloader or spot loader it will kick me and corupt the chunk. can someone please help me with this problem? server log / [WARNING] Failed to handle packet for gamerfreek2500/192.168.2.4: java.lang.NullPointerException java.lang.NullPointerException at com.google.common.collect.ImmutableSetMultimap$Builder.putAll(ImmutableSetMultimap.java:246) at net.minecraftforge.common.ForgeChunkManager.forceChunk(ForgeChunkManager.java:730) at codechicken.chunkloader.ChunkLoaderManager$TicketManager.addChunk(ChunkLoaderManager.java:115) at codechicken.chunkloader.ChunkLoaderManager$ChunkLoaderOrganiser.forceChunks(ChunkLoaderManager.java:240) at codechicken.chunkloader.ChunkLoaderManager$ChunkLoaderOrganiser.addChunkLoader(ChunkLoaderManager.java:187) at codechicken.chunkloader.ChunkLoaderManager.addChunkLoader(ChunkLoaderManager.java:698) at codechicken.chunkloader.TileChunkLoaderBase.activate(TileChunkLoaderBase.java:126) at codechicken.chunkloader.TileChunkLoaderBase.onBlockPlacedBy(TileChunkLoaderBase.java:86) at codechicken.chunkloader.BlockChunkLoader.a(BlockChunkLoader.java:118) at vq.placeBlockAt(ItemBlock.java:208) at vq.a(ItemBlock.java:97) at ur.a(SourceFile:88) at ir.a(ItemInWorldManager.java:424) at iv.a(NetServerHandler.java:579) at fk.a(SourceFile:58) at cg.b(TcpConnection.java:458) at iv.d(NetServerHandler.java:136) at iw.b(NetworkListenThread.java:57) at ht.b(SourceFile:30) at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:703) at ho.r(DedicatedServer.java:269) at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:599) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497) at fy.run(SourceFile:849)