All the Mods 6 server crashes when I try to start

[arthur985]

The error seems to happen when the world loads, I already try to delete the world, but after some days the error happens again. We are using the 1.8.7 version of the modpack. Can someone help me? Here is the crash report:

java.util.concurrent.CompletionException: java.lang.NullPointerException
        at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) ~[?:1.8.0_302] {}
        at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) ~[?:1.8.0_302] {}
        at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:618) ~[?:1.8.0_302] {}
        at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:591) ~[?:1.8.0_302] {}
        at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:456) ~[?:1.8.0_302] {}
        at net.minecraft.world.chunk.ChunkTaskPriorityQueueSorter.func_219083_b(SourceFile:58) ~[?:?] {re:classloading}
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
        at net.minecraft.world.server.ServerChunkProvider$ChunkExecutor.func_213166_h(ServerChunkProvider.java:519) ~[?:?] {re:classloading}
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
        at net.minecraft.world.server.ServerChunkProvider$ChunkExecutor.func_213168_p(ServerChunkProvider.java:527) ~[?:?] {re:classloading}
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213161_c(SourceFile:127) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
        at net.minecraft.world.server.ServerChunkProvider.func_212849_a_(ServerChunkProvider.java:135) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.world.World.func_217353_a(World.java:167) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:computing_frames,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:mixin:APP:mixins.common.json:LevelMixin,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at net.minecraft.world.IWorldReader.func_217348_a(IWorldReader.java:112) ~[?:?] {re:computing_frames,pl:runtimedistcleaner:A,re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:runtimedistcleaner:A}
        at net.minecraft.world.World.func_212866_a_(World.java:163) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:computing_frames,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:mixin:APP:mixins.common.json:LevelMixin,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at net.minecraft.world.World.func_175726_f(World.java:159) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:computing_frames,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:mixin:APP:mixins.common.json:LevelMixin,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at net.minecraft.world.World.func_175625_s(World.java:598) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:computing_frames,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,xf:fml:twilightforest:hitbox,pl:mixin:APP:mixins.common.json:LevelMixin,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at dev.compactmods.crafting.field.ActiveWorldFields.lambda$registerField$1(ActiveWorldFields.java:76) ~[compactcrafting:1.0.0-beta.6] {re:classloading}
        at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:1.8.0_302] {}
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[?:1.8.0_302] {}
        at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_302] {}
        at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[?:1.8.0_302] {}
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_302] {}
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_302] {}
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:1.8.0_302] {}
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:1.8.0_302] {}
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_302] {}
        at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485) ~[?:1.8.0_302] {}
        at dev.compactmods.crafting.field.ActiveWorldFields.registerField(ActiveWorldFields.java:75) ~[compactcrafting:1.0.0-beta.6] {re:classloading}
        at dev.compactmods.crafting.field.capability.CapabilityActiveWorldFields$1.lambda$readNBT$0(CapabilityActiveWorldFields.java:58) ~[compactcrafting:1.0.0-beta.6] {re:classloading}
        at java.lang.Iterable.forEach(Iterable.java:75) ~[?:1.8.0_302] {}
        at dev.compactmods.crafting.field.capability.CapabilityActiveWorldFields$1.readNBT(CapabilityActiveWorldFields.java:47) ~[compactcrafting:1.0.0-beta.6] {re:classloading}
        at dev.compactmods.crafting.field.capability.CapabilityActiveWorldFields$1.readNBT(CapabilityActiveWorldFields.java:28) ~[compactcrafting:1.0.0-beta.6] {re:classloading}
        at dev.compactmods.crafting.field.capability.events.CapabilitySetupForgeEvents$1.deserializeNBT(CapabilitySetupForgeEvents.java:42) ~[compactcrafting:1.0.0-beta.6] {re:classloading}
        at dev.compactmods.crafting.field.capability.events.CapabilitySetupForgeEvents$1.deserializeNBT(CapabilitySetupForgeEvents.java:34) ~[compactcrafting:1.0.0-beta.6] {re:classloading}
        at net.minecraftforge.common.capabilities.CapabilityDispatcher.deserializeNBT(CapabilityDispatcher.java:139) ~[forge:?] {re:classloading}
        at net.minecraftforge.common.capabilities.CapabilityDispatcher.deserializeNBT(CapabilityDispatcher.java:48) ~[forge:?] {re:classloading}
        at net.minecraftforge.common.util.WorldCapabilityData.func_76184_a(WorldCapabilityData.java:51) ~[forge:?] {re:classloading}
        at net.minecraft.world.storage.DimensionSavedDataManager.func_223409_c(DimensionSavedDataManager.java:69) ~[?:?] {re:classloading,pl:accesstransformer:B}
        at net.minecraft.world.storage.DimensionSavedDataManager.func_215753_b(DimensionSavedDataManager.java:52) ~[?:?] {re:classloading,pl:accesstransformer:B}
        at net.minecraft.world.storage.DimensionSavedDataManager.func_215752_a(DimensionSavedDataManager.java:37) ~[?:?] {re:classloading,pl:accesstransformer:B}
        at net.minecraft.world.server.ServerWorld.initCapabilities(ServerWorld.java:1452) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:forgeendertech:coremod,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:forgeendertech:coremod,pl:mixin:APP:mixins.common.json:ServerLevelMixin,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:APP:mixins.zycraft.json:world.server.ServerWorldMixin,pl:mixin:APP:immersiveengineering.mixins.json:coremods.ServerWorldMixin,pl:mixin:APP:quark.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at net.minecraft.world.server.ServerWorld.<init>(ServerWorld.java:204) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:forgeendertech:coremod,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:forgeendertech:coremod,pl:mixin:APP:mixins.common.json:ServerLevelMixin,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:APP:mixins.zycraft.json:world.server.ServerWorldMixin,pl:mixin:APP:immersiveengineering.mixins.json:coremods.ServerWorldMixin,pl:mixin:APP:quark.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at net.minecraft.server.MinecraftServer.func_240787_a_(MinecraftServer.java:335) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixin.terraforged.json:common.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at net.minecraft.server.MinecraftServer.func_240800_l__(MinecraftServer.java:308) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixin.terraforged.json:common.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:168) ~[?:?] {re:classloading,pl:accesstransformer:B}
        at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:621) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixin.terraforged.json:common.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:APP:mixin.terraforged.json:common.MixinMinecraftServer,pl:mixin:APP:resourcefulbees.mixins.json:MixinMinecraftServer,pl:mixin:APP:elementalcraft.mixins.json:MixinMinecraftServer,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_302] {}
Caused by: java.lang.NullPointerException
        at appeng.hooks.ticking.ServerTileRepo.addTile(ServerTileRepo.java:60) ~[appliedenergistics2:8.4.2] {re:classloading}
        at appeng.hooks.ticking.TickHandler.addInit(TickHandler.java:171) ~[appliedenergistics2:8.4.2] {re:classloading}
        at appeng.me.helpers.AENetworkProxy.validate(AENetworkProxy.java:103) ~[appliedenergistics2:8.4.2] {re:classloading}
        at appeng.tile.grid.AENetworkInvTileEntity.func_145829_t(AENetworkInvTileEntity.java:93) ~[appliedenergistics2:8.4.2] {re:classloading}
        at net.minecraft.world.chunk.Chunk.func_177426_a(Chunk.java:409) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.world.chunk.Chunk.func_150813_a(Chunk.java:399) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.world.chunk.storage.ChunkSerializer.func_222650_a(ChunkSerializer.java:402) ~[?:?] {re:mixin,re:classloading,pl:mixin:APP:chocolate.mixins.json:world.chunk.storage.ChunkSerializerMixin,pl:mixin:APP:architectury.mixins.json:MixinChunkSerializer,pl:mixin:APP:mixins.zycraft.json:world.chunk.storage.ChunkSerializerMixin,pl:mixin:APP:ferritecore.chunknbt.mixin.json:ChunkSerializerMixin,pl:mixin:A}
        at net.minecraft.world.chunk.storage.ChunkSerializer.mdfa2d4b$lambda$replacePostLoad$0$0(ChunkSerializer.java:2082) ~[?:?] {re:mixin,re:classloading,pl:mixin:APP:chocolate.mixins.json:world.chunk.storage.ChunkSerializerMixin,pl:mixin:APP:architectury.mixins.json:MixinChunkSerializer,pl:mixin:APP:mixins.zycraft.json:world.chunk.storage.ChunkSerializerMixin,pl:mixin:APP:ferritecore.chunknbt.mixin.json:ChunkSerializerMixin,pl:mixin:A}
        at net.minecraft.world.chunk.Chunk.func_217318_w(Chunk.java:457) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.world.server.ChunkManager.func_219237_a_(ChunkManager.java:582) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.zycraft.json:world.server.ChunkManagerMixin,pl:mixin:APP:ftbchunks-common.mixins.json:ChunkMapMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at com.mojang.datafixers.util.Either.lambda$mapLeft$0(Either.java:162) ~[?:?] {re:classloading}
        at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[?:?] {re:classloading}
        at com.mojang.datafixers.util.Either.mapLeft(Either.java:162) ~[?:?] {re:classloading}
        at net.minecraft.world.server.ChunkManager.func_219193_a_(ChunkManager.java:569) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.zycraft.json:world.server.ChunkManagerMixin,pl:mixin:APP:ftbchunks-common.mixins.json:ChunkMapMixin,pl:mixin:A,pl:runtimedistcleaner:A}
        at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:616) ~[?:1.8.0_302] {}
        ... 46 more