[18:36:46 WARN]: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_15_R1.block.CraftBlockState cannot be cast to org.bukkit.block.Chest
[18:36:46 WARN]:        at fr.mineral.Core.Arena.Coffre.clear(Coffre.java:31)
[18:36:46 WARN]:        at fr.mineral.Core.House.spawnCoffreEquipe(House.java:111)
[18:36:46 WARN]:        at fr.mineral.Core.Game.demarrerPartie(Game.java:803)
[18:36:46 WARN]:        at fr.mineral.Core.Game.setPlayerReady(Game.java:194)
[18:36:46 WARN]:        at fr.mineral.Commands.ReadyCommand.onCommand(ReadyCommand.java:24)
[18:36:46 WARN]:        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45)
[18:36:46 WARN]:        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159)
[18:36:46 WARN]:        at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:752)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.PlayerConnection.handleCommand(PlayerConnection.java:1825)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1633)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:47)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:5)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:23)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:1038)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:1031)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1015)
[18:36:46 WARN]:        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:938)
[18:36:46 WARN]:        at java.lang.Thread.run(Thread.java:748)