Chain Block Error, 1.21.10

[00:06:38 INFO]: [MythicDungeons] Enabling MythicDungeons v2.0.1-SNAPSHOT [00:06:39 ERROR]: [org.bukkit.configuration.serialization.ConfigurationSerialization] Could not call method 'public static org.bukkit.inventory.ItemStack org.bukkit.inventory.ItemStack.deserialize(java.util.Map)' of class org.bukkit.inventory.ItemStack for deserialization java.lang.IllegalStateException: Failed to parse either. First: Not a tag id; Second: Failed to parse either. First: Not a list: "minecraft:chain"; Second: Failed to get element minecraft:chain missed input: {"minecraft:repairable":{items:"minecraft:chain"}} at com.mojang.serialization.DataResult$Error.getOrThrow(DataResult.java:287) ~[datafixerupper-8.0.16.jar:?] at com.mojang.serialization.DataResult.getOrThrow(DataResult.java:81) ~[datafixerupper-8.0.16.jar:?] at org.bukkit.craftbukkit.util.CraftMagicNumbers.deserializeItem(CraftMagicNumbers.java:517) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at org.bukkit.craftbukkit.util.CraftMagicNumbers.deserializeStack(CraftMagicNumbers.java:613) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at org.bukkit.inventory.ItemStack.deserialize(ItemStack.java:514) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?] at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?] at org.bukkit.configuration.serialization.ConfigurationSerialization.deserializeViaMethod(ConfigurationSerialization.java:87) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.serialization.ConfigurationSerialization.deserialize(ConfigurationSerialization.java:129) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.serialization.ConfigurationSerialization.deserializeObject(ConfigurationSerialization.java:209) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:58) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:264) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:247) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:576) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:210) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:552) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:597) ~[snakeyaml-2.2.jar:?] at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:49) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:264) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:247) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:576) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:210) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:552) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:597) ~[snakeyaml-2.2.jar:?] at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:49) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:264) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:247) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:576) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:210) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:552) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:597) ~[snakeyaml-2.2.jar:?] at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:49) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:264) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:247) ~[snakeyaml-2.2.jar:?] at org.bukkit.configuration.file.YamlConstructor.construct(YamlConstructor.java:37) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.YamlConfiguration.fromNodeTree(YamlConfiguration.java:164) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.YamlConfiguration.fromNodeTree(YamlConfiguration.java:162) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlConfiguration.java:121) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:160) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:128) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at MythicDungeons-2.0.1-SNAPSHOT.jar/net.playavalon.mythicdungeons.managers.LootTableManager.(LootTableManager.java:33) ~[MythicDungeons-2.0.1-SNAPSHOT.jar:?] at MythicDungeons-2.0.1-SNAPSHOT.jar/net.playavalon.mythicdungeons.MythicDungeons.onEnable(MythicDungeons.java:277) ~[MythicDungeons-2.0.1-SNAPSHOT.jar:?] at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:639) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:596) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at net.minecraft.server.MinecraftServer.initPostWorld(MinecraftServer.java:637) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:368) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1257) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:384) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?] [00:06:39 ERROR]: [org.bukkit.configuration.serialization.ConfigurationSerialization] Could not call constructor 'public net.playavalon.mythicdungeons.dungeons.rewards.LootTable(java.util.Map)' of class net.playavalon.mythicdungeons.dungeons.rewards.LootTable for deserialization java.lang.NullPointerException: Cannot invoke "org.bukkit.inventory.ItemStack.clone()" because the return value of "net.playavalon.mythicdungeons.dungeons.rewards.LootTableItem.getItem()" is null at MythicDungeons-2.0.1-SNAPSHOT.jar/net.playavalon.mythicdungeons.dungeons.rewards.LootTable.initMenu(LootTable.java:248) ~[MythicDungeons-2.0.1-SNAPSHOT.jar:?] at MythicDungeons-2.0.1-SNAPSHOT.jar/net.playavalon.mythicdungeons.dungeons.rewards.LootTable.(LootTable.java:48) ~[MythicDungeons-2.0.1-SNAPSHOT.jar:?] at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62) ~[?:?] at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502) ~[?:?] at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486) ~[?:?] at org.bukkit.configuration.serialization.ConfigurationSerialization.deserializeViaCtor(ConfigurationSerialization.java:107) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.serialization.ConfigurationSerialization.deserialize(ConfigurationSerialization.java:145) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.serialization.ConfigurationSerialization.deserializeObject(ConfigurationSerialization.java:209) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:58) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:264) ~[snakeyaml-2.2.jar:?] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:247) ~[snakeyaml-2.2.jar:?] at org.bukkit.configuration.file.YamlConstructor.construct(YamlConstructor.java:37) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.YamlConfiguration.fromNodeTree(YamlConfiguration.java:164) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.YamlConfiguration.fromNodeTree(YamlConfiguration.java:162) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlConfiguration.java:121) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:160) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:128) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at MythicDungeons-2.0.1-SNAPSHOT.jar/net.playavalon.mythicdungeons.managers.LootTableManager.(LootTableManager.java:33) ~[MythicDungeons-2.0.1-SNAPSHOT.jar:?] at MythicDungeons-2.0.1-SNAPSHOT.jar/net.playavalon.mythicdungeons.MythicDungeons.onEnable(MythicDungeons.java:277) ~[MythicDungeons-2.0.1-SNAPSHOT.jar:?] at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.10-R0.1-SNAPSHOT.jar:?] at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:639) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:596) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at net.minecraft.server.MinecraftServer.initPostWorld(MinecraftServer.java:637) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:368) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1257) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:384) ~[paper-1.21.10.jar:1.21.10-117-df4b668] at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?] [00:06:39 INFO]: [MythicDungeons] Using PaperListener... [00:06:39 INFO]: [MythicDungeons] Using default parties! Enabled party support. [00:06:39 INFO]: [MythicDungeons] MythicMobs plugin found! Enabled MythicMobs support. [00:06:39 INFO]: [PlaceholderAPI] Successfully registered internal expansion: md [2.0.1] [00:06:39 INFO]: [org.reflections.Reflections] Reflections took 41 ms to scan 1 urls, producing 95 keys and 613 values [00:06:39 INFO]: [org.reflections.Reflections] Reflections took 5 ms to scan 1 urls, producing 11 keys and 192 values [00:06:39 INFO]: [org.reflections.Reflections] Reflections took 3 ms to scan 1 urls, producing 8 keys and 82 values [00:06:39 INFO]: [org.reflections.Reflections] Reflections took 1 ms to scan 1 urls, producing 5 keys and 38 values [00:06:39 INFO]: [MythicDungeons] * Loaded 37 functions. [00:06:39 INFO]: [MythicDungeons] * Loaded 14 triggers. [00:06:39 INFO]: [MythicDungeons] * Loaded 10 conditions. [00:06:39 INFO]: [MythicDungeons] GUI menus initialized! [00:06:39 INFO]: [MythicDungeons] Mythic Dungeons v2.0.1 initialized! Happy dungeon-ing!