My server, which I had been running Natural Magics from the ATLauncher for some weeks now, stops as soon as I or one of my friends try to join it. From what I've read from others with a similar issue, it could be that the server is running out of data and being shut down by Aternos, but I do not think this is the case because nothing data intensive has been done, from the logs it looks like a modpack issue. How can I fix this without losing my playerdata?
Crash log:
[12:40:15] [Server thread/INFO]: Starting minecraft server version 1.7.10
[12:40:41] [Server thread/INFO]: Loading properties
[12:40:41] [Server thread/INFO]: Default game type: SURVIVAL
[12:40:41] [Server thread/INFO]: Generating keypair
[12:40:41] [Server thread/INFO]: Starting Minecraft server on *:47148
[12:40:51] [Server thread/INFO]: Preparing level "world"
[12:40:52] [Server thread/INFO]: Preparing start region for level 0
[12:40:53] [Server thread/INFO]: Done (2.511s)! For help, type "help" or "?"
[12:40:53] [Server thread/INFO]: Starting GS4 status listener
[12:40:53] [Query Listener #1/INFO]: Query running on 0.0.0.0:57148
[12:41:05] [User Authenticator #1/INFO]: UUID of player Jemmerl is 4e63c9e6-3439-4b65-90c3-28f18c133180
[12:41:08] [Server thread/INFO]: Jemmerl[/174.59.205.154:62205] logged
in with entity id 738 at (-951.5290899271439, 56.0, 11.032613050331877)
[12:41:08] [Server thread/INFO]: Jemmerl joined the game
[12:41:08] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.ArrayIndexOutOfBoundsException: -1
at net.minecraft.world.chunk.NibbleArray.func_76582_a(SourceFile:28) ~[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$Task.finish(AsynchronousExecutor.java:189)
~[AsynchronousExecutor$Task.class:?]
at
net.minecraftforge.common.util.AsynchronousExecutor.finishActive(AsynchronousExecutor.java:354)
~[AsynchronousExecutor.class:?]
at net.minecraftforge.common.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:30) ~[ChunkIOExecutor.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:596) ~[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:427) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]
[12:41:08] [Server thread/ERROR]: This crash report has been saved to:
/aternos/servers/Jemmerl/./crash-reports/crash-2017-10-06_12.41.08-server.txt
[12:41:08] [Server thread/INFO]: Stopping server
[12:41:08] [Server thread/INFO]: Saving players
[12:41:08] [Server thread/INFO]: Saving worlds
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Overworld
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Nether
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/The End
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Twilight Forest
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Erebus
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Soul Network Dimension
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Dungeon
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Atum
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Spirit World
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Torment
[12:41:08] [Server thread/INFO]: Saving chunks for level 'world'/Mirror
[12:41:09] [Server thread/INFO]: Saving chunks for level 'world'/The Outer Lands
[12:41:09] [Server thread/INFO]: Saving chunks for level 'world'/Bedrock
[12:41:09] [Server thread/INFO]: Saving chunks for level 'world'/SpectreWorld