[19:02:27 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'miner' in plugin GGMiner v0.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:143) ~[PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:666) ~[PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1189) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1001) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_111]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_111]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:774) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_111]
Caused by: java.lang.NullPointerException
        at me.jwhz.miner.miner.PlayerCurrencyMiner.<init>(PlayerCurrencyMiner.java:53) ~[?:?]
        at me.jwhz.miner.GGMiner.startMining(GGMiner.java:294) ~[?:?]
        at me.jwhz.miner.GGMiner$2.onCommand(GGMiner.java:223) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[PaperSpigot-1.8.8.jar:git-PaperSpigot-"8b18730"]
        ... 15 more