[14:52:40] [Server-Worker-1/FATAL]: Failed to schedule load callback for chunk [0, 1]
java.util.concurrent.CompletionException: net.minecraft.server.v1_15_R1.ReportedException: Exception generating new chunk
	at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) ~[?:1.8.0_262]
	at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) ~[?:1.8.0_262]
	at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:975) ~[?:1.8.0_262]
	at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:940) ~[?:1.8.0_262]
	at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:456) ~[?:1.8.0_262]
	at net.minecraft.server.v1_15_R1.ChunkTaskQueueSorter.b(SourceFile:58) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ThreadedMailbox.e(ThreadedMailbox.java:78) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ThreadedMailbox.a(ThreadedMailbox.java:121) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ThreadedMailbox.run(ThreadedMailbox.java:86) ~[patched_1.15.2.jar:git-Paper-390]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_262]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_262]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_262]
Caused by: net.minecraft.server.v1_15_R1.ReportedException: Exception generating new chunk
	at net.minecraft.server.v1_15_R1.PlayerChunkMap.lambda$null$39(PlayerChunkMap.java:1217) ~[patched_1.15.2.jar:git-Paper-390]
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PlayerChunkMap.lambda$b$41(PlayerChunkMap.java:1202) ~[patched_1.15.2.jar:git-Paper-390]
	at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:966) ~[?:1.8.0_262]
	... 9 more
Caused by: java.lang.UnsupportedOperationException: Custom generator me.wazup.skywars.Skywars$6 is missing required method generateChunkData
	at org.bukkit.generator.ChunkGenerator.generateChunkData(ChunkGenerator.java:117) ~[patched_1.15.2.jar:git-Paper-390]
	at org.bukkit.craftbukkit.v1_15_R1.generator.CustomChunkGenerator.buildBase(CustomChunkGenerator.java:137) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ChunkStatus.lambda$static$6(ChunkStatus.java:51) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ChunkStatus$d.doWork(ChunkStatus.java:243) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ChunkStatus.a(ChunkStatus.java:187) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PlayerChunkMap.lambda$null$39(PlayerChunkMap.java:1204) ~[patched_1.15.2.jar:git-Paper-390]
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PlayerChunkMap.lambda$b$41(PlayerChunkMap.java:1202) ~[patched_1.15.2.jar:git-Paper-390]
	at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:966) ~[?:1.8.0_262]
	... 9 more
[14:52:40] [Server thread/INFO]: Negative index in crash report handler (18/22)
[14:52:40] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'sw' in plugin Skywars v4.8
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.15.2.jar:git-Paper-390]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.15.2.jar:git-Paper-390]
	at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:761) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PlayerConnection.handleCommand(PlayerConnection.java:1869) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1677) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$ensureMainThread$1(PlayerConnectionUtils.java:23) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:1106) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:1099) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1060) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:975) ~[patched_1.15.2.jar:git-Paper-390]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_262]
Caused by: net.minecraft.server.v1_15_R1.ReportedException: Exception generating new chunk
	at net.minecraft.server.v1_15_R1.MinecraftServer.initWorld(MinecraftServer.java:522) ~[patched_1.15.2.jar:git-Paper-390]
	at org.bukkit.craftbukkit.v1_15_R1.CraftServer.createWorld(CraftServer.java:1075) ~[patched_1.15.2.jar:git-Paper-390]
	at org.bukkit.Bukkit.createWorld(Bukkit.java:548) ~[patched_1.15.2.jar:git-Paper-390]
	at me.wazup.skywars.Skywars.onCommand(Skywars.java:1190) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.15.2.jar:git-Paper-390]
	... 17 more
Caused by: java.lang.UnsupportedOperationException: Custom generator me.wazup.skywars.Skywars$6 is missing required method generateChunkData
	at org.bukkit.generator.ChunkGenerator.generateChunkData(ChunkGenerator.java:117) ~[patched_1.15.2.jar:git-Paper-390]
	at org.bukkit.craftbukkit.v1_15_R1.generator.CustomChunkGenerator.buildBase(CustomChunkGenerator.java:137) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ChunkStatus.lambda$static$6(ChunkStatus.java:51) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ChunkStatus$d.doWork(ChunkStatus.java:243) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ChunkStatus.a(ChunkStatus.java:187) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PlayerChunkMap.lambda$null$39(PlayerChunkMap.java:1204) ~[patched_1.15.2.jar:git-Paper-390]
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.PlayerChunkMap.lambda$b$41(PlayerChunkMap.java:1202) ~[patched_1.15.2.jar:git-Paper-390]
	at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:966) ~[?:1.8.0_262]
	at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:940) ~[?:1.8.0_262]
	at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:456) ~[?:1.8.0_262]
	at net.minecraft.server.v1_15_R1.ChunkTaskQueueSorter.b(SourceFile:58) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ThreadedMailbox.e(ThreadedMailbox.java:78) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ThreadedMailbox.a(ThreadedMailbox.java:121) ~[patched_1.15.2.jar:git-Paper-390]
	at net.minecraft.server.v1_15_R1.ThreadedMailbox.run(ThreadedMailbox.java:86) ~[patched_1.15.2.jar:git-Paper-390]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_262]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_262]
	... 1 more