Bukkit

[17:24:14 INFO]: YDarkGamerY issued server command: /lock
[17:24:14 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'lock' in plugin ChestLock v1.7.1
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:138) ~[craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchCommand(CraftServer.java:682) ~[craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at net.minecraft.server.v1_13_R2.PlayerConnection.handleCommand(PlayerConnection.java:1579) ~[craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1439) ~[craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(SourceFile:37) ~[craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(SourceFile:9) ~[craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.a(SourceFile:10) ~[craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_191]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_191]
at net.minecraft.server.v1_13_R2.SystemUtils.a(SourceFile:199) [craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:838) [craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:382) [craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:791) [craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:694) [craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
Caused by: java.lang.NoSuchMethodError: org.bukkit.entity.Player.getTargetBlock(Ljava/util/HashSet;I)Lorg/bukkit/block/Block;
at com.codisimus.plugins.chestlock.ChestLockCommand.lock(ChestLockCommand.java:460) ~[?:?]
at com.codisimus.plugins.chestlock.ChestLockCommand.onCommand(ChestLockCommand.java:52) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.13.2.jar:git-Bukkit-a5b9c7b]
... 15 more

Why this?