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Problem with modded server

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i've playing with a friend some days ago and today it doesn't let me open the server showing this rep


[Server thread/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:449) ~[aye.class:?]
        at net.minecraft.world.chunk.storage.AnvilChunkLoader.checkedReadChunkFromNBT__Async(AnvilChunkLoader.java:128) ~[aye.class:?]
        at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:92) ~[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(Unknown Source) [?:1.8.0_211]


I don't actually know what to do to make it work i'm very novice in doing this things and the server itself has been running very poorly since i started it kicking out my friend each 5 or 10 minutes, going very laggy and crashing a lot.

I have 44 mods and it wont let me give the server more than 1.6Gb of ram for some reason I don't know even tho I have 20 Gb of ram, (i7 7700k and a gtx 1050ti, for if you need that info)


java -Xms1G -Xmx8G -jar forge-1.12.2- nogui
Invalid maximum heap size: -Xmx8G
The specified size exceeds the maximum representable size.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.


This is what it shows when I try to start the server if I give it more than 1.6


Hope you can help

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