Whenever my friend right-clicks a rat cage, the whole server just crashes. It used to work perfectly well, but now it just crashes, also when we try to break the block, it crashes.

java.lang.NoClassDefFoundError: com/github/alexthe666/rats/server/blocks/BlockRatCage$1
at com.github.alexthe666.rats.server.blocks.BlockRatCage.func_196271_a(BlockRatCage.java:283) ~[rats:7.1.0] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.block.AbstractBlock$AbstractBlockState.func_196956_a(AbstractBlock.java:655) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:immersiveengineering.mixins.json:coremods.AbstractBlockStateMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.block.AbstractBlock$AbstractBlockState.func_241482_a(AbstractBlock.java:595) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:immersiveengineering.mixins.json:coremods.AbstractBlockStateMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.world.World.markAndNotifyBlock(World.java:245) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,pl:runtimedistcleaner:A}
at net.minecraft.world.World.func_241211_a_(World.java:212) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,pl:runtimedistcleaner:A}
at net.minecraft.world.World.func_180501_a(World.java:176) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,pl:runtimedistcleaner:A}
at net.minecraftforge.common.extensions.IForgeBlock.removedByPlayer(IForgeBlock.java:197) ~[forge:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:runtimedistcleaner:A}
at net.minecraftforge.common.extensions.IForgeBlockState.removedByPlayer(IForgeBlockState.java:157) ~[forge:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.server.management.PlayerInteractionManager.removeBlock(PlayerInteractionManager.java:271) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:PlayerInteractionManagerMixin,pl:mixin:A}
at net.minecraft.server.management.PlayerInteractionManager.func_180237_b(PlayerInteractionManager.java:254) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:PlayerInteractionManagerMixin,pl:mixin:A}
at net.minecraft.server.management.PlayerInteractionManager.func_229860_a_(PlayerInteractionManager.java:220) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:PlayerInteractionManagerMixin,pl:mixin:A}
at net.minecraft.server.management.PlayerInteractionManager.func_225416_a(PlayerInteractionManager.java:168) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:PlayerInteractionManagerMixin,pl:mixin:A}
at net.minecraft.network.play.ServerPlayNetHandler.func_147345_a(ServerPlayNetHandler.java:929) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:fml:astralsorcery:reach_set_server_entity_interact,xf:fml:astralsorcery:allow_entity_interaction,pl:mixin:A}
at net.minecraft.network.play.client.CPlayerDiggingPacket.func_148833_a(SourceFile:40) ~[?:?] {re:classloading}
at net.minecraft.network.play.client.CPlayerDiggingPacket.func_148833_a(SourceFile:10) ~[?:?] {re:classloading}
at net.minecraft.network.PacketThreadUtil.func_225383_a(SourceFile:21) ~[?:?] {re:classloading}
at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) ~[?:?] {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.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?] {re:mixin,re:computing_frames,re:classloading}
at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:733) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:159) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
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.server.MinecraftServer.func_213205_aW(MinecraftServer.java:716) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:710) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
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.server.MinecraftServer.func_213202_o(MinecraftServer.java:696) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:645) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.lambda$startServer$0(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:A,pl:runtimedistcleaner:A}
at java.lang.Thread.run(Unknown Source) [?:1.8.0_281] {}
Caused by: java.lang.ClassNotFoundException: com.github.alexthe666.rats.server.blocks.BlockRatCage$1
at java.lang.ClassLoader.findClass(Unknown Source) ~[?:1.8.0_281] {}
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_281] {}
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:106) ~[modlauncher-8.0.9.jar:?] {re:classloading}
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_281] {}
... 29 more
Suppressed: java.lang.ClassNotFoundException: Failed to find class bytes for com.github.alexthe666.rats.server.blocks.BlockRatCage$1
at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:260) ~[modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:136) ~[modlauncher-8.0.9.jar:?] {re:classloading}
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:98) ~[modlauncher-8.0.9.jar:?] {re:classloading}
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_281] {}
at com.github.alexthe666.rats.server.blocks.BlockRatCage.func_196271_a(BlockRatCage.java:283) ~[rats:7.1.0] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.block.AbstractBlock$AbstractBlockState.func_196956_a(AbstractBlock.java:655) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:immersiveengineering.mixins.json:coremods.AbstractBlockStateMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.block.AbstractBlock$AbstractBlockState.func_241482_a_(AbstractBlock.java:595) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:immersiveengineering.mixins.json:coremods.AbstractBlockStateMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.world.World.markAndNotifyBlock(World.java:245) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,pl:runtimedistcleaner:A}
at net.minecraft.world.World.func_241211_a_(World.java:212) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,pl:runtimedistcleaner:A}
at net.minecraft.world.World.func_180501_a(World.java:176) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:observerlib:coremodmethod,xf:fml:astralsorcery:sun_brightness_server,pl:runtimedistcleaner:A}
at net.minecraftforge.common.extensions.IForgeBlock.removedByPlayer(IForgeBlock.java:197) ~[forge:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:runtimedistcleaner:A}
at net.minecraftforge.common.extensions.IForgeBlockState.removedByPlayer(IForgeBlockState.java:157) ~[forge:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.server.management.PlayerInteractionManager.removeBlock(PlayerInteractionManager.java:271) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:PlayerInteractionManagerMixin,pl:mixin:A}
at net.minecraft.server.management.PlayerInteractionManager.func_180237_b(PlayerInteractionManager.java:254) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:PlayerInteractionManagerMixin,pl:mixin:A}
at net.minecraft.server.management.PlayerInteractionManager.func_229860_a_(PlayerInteractionManager.java:220) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:PlayerInteractionManagerMixin,pl:mixin:A}
at net.minecraft.server.management.PlayerInteractionManager.func_225416_a(PlayerInteractionManager.java:168) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:kubejs-common.mixins.json:PlayerInteractionManagerMixin,pl:mixin:A}
at net.minecraft.network.play.ServerPlayNetHandler.func_147345_a(ServerPlayNetHandler.java:929) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:fml:astralsorcery:reach_set_server_entity_interact,xf:fml:astralsorcery:allow_entity_interaction,pl:mixin:A}
at net.minecraft.network.play.client.CPlayerDiggingPacket.func_148833_a(SourceFile:40) ~[?:?] {re:classloading}
at net.minecraft.network.play.client.CPlayerDiggingPacket.func_148833_a(SourceFile:10) ~[?:?] {re:classloading}
at net.minecraft.network.PacketThreadUtil.func_225383_a(SourceFile:21) ~[?:?] {re:classloading}
at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) ~[?:?] {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.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?] {re:mixin,re:computing_frames,re:classloading}
at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:733) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:159) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
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.server.MinecraftServer.func_213205_aW(MinecraftServer.java:716) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:710) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
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.server.MinecraftServer.func_213202_o(MinecraftServer.java:696) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:645) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.lambda$startServer$0(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:A,pl:runtimedistcleaner:A}
at java.lang.Thread.run(Unknown Source) [?:1.8.0_281] {}
Caused by: java.nio.channels.ClosedChannelException
at sun.nio.ch.FileChannelImpl.ensureOpen(Unknown Source) ~[?:1.8.0_281] {}
at sun.nio.ch.FileChannelImpl.position(Unknown Source) ~[?:1.8.0_281] {}
at sun.nio.ch.FileChannelImpl.position(Unknown Source) ~[?:1.8.0_281] {}
at com.sun.nio.zipfs.ZipFileSystem.readFullyAt(ZipFileSystem.java:952) ~[zipfs.jar:1.8.0_281] {}
at com.sun.nio.zipfs.ZipFileSystem.readFullyAt(ZipFileSystem.java:945) ~[zipfs.jar:1.8.0_281] {}
at com.sun.nio.zipfs.ZipFileSystem.getDataPos(ZipFileSystem.java:931) ~[zipfs.jar:1.8.0_281] {}
at com.sun.nio.zipfs.ZipFileSystem.access$400(ZipFileSystem.java:80) ~[zipfs.jar:1.8.0_281] {}
at com.sun.nio.zipfs.ZipFileSystem$EntryInputStream.(ZipFileSystem.java:1500) ~[zipfs.jar:1.8.0_281] {}
at com.sun.nio.zipfs.ZipFileSystem.getInputStream(ZipFileSystem.java:1430) ~[zipfs.jar:1.8.0_281] {}
at com.sun.nio.zipfs.ZipFileSystem.newInputStream(ZipFileSystem.java:547) ~[zipfs.jar:1.8.0_281] {}
at com.sun.nio.zipfs.ZipPath.newInputStream(ZipPath.java:645) ~[zipfs.jar:1.8.0_281] {}
at com.sun.nio.zipfs.ZipFileSystemProvider.newInputStream(ZipFileSystemProvider.java:278) ~[zipfs.jar:1.8.0_281] {}
at java.nio.file.Files.newInputStream(Unknown Source) ~[?:1.8.0_281] {}
at net.minecraftforge.fml.loading.ModJarURLHandler$ModJarURLConnection.getInputStream(ModJarURLHandler.java:87) ~[minecraftserver.jar:35.1] {}
at cpw.mods.modlauncher.TransformingClassLoader$AutoURLConnection.(TransformingClassLoader.java:174) ~[modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:247) ~[modlauncher-8.0.9.jar:?] {}
... 32 more_

My game crashes when i right click on a rat.