Help me with config...

Spoiler: Error

Code (Text):

[08:04:47 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'clearchat' in plugin ChatPro v1.0.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_171]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_171]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_171]
Caused by: java.lang.NullPointerException
        at me.tozymc.chatpro.cmds.ClearChatCmd.onCommand(ClearChatCmd.java:24) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        ... 15 more

Spoiler: Class ClearChatCmd

Code (Java):

package me.tozymc.chatpro.cmds;

import me.tozymc.chatpro.ChatPro;
import me.tozymc.chatpro.utils.Utils;
import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import static me.tozymc.chatpro.utils.Utils.replace;
import static me.tozymc.chatpro.utils.Utils.sendHelp;

public class ClearChatCmd implements CommandExecutor {
    private ChatPro plugin;

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (cmd.getName().equalsIgnoreCase("clearchat")) {
            if (args.length == 0) {
                if (Utils.hasPerms("clear", sender)) {
                    for (int i = 0; i <= 120; i++) {
                        sender.sendMessage("");
                    }
                    sender.sendMessage(plugin.getConfig().getString("Message.ClearChat"));
                }
            }
            if (args.length == 1) {
                if ((args[0].equalsIgnoreCase("all")) && (Utils.hasPerms("admin", sender))) {
                    for (Player sender1 : Bukkit.getOnlinePlayers()) {
                        for (int i = 0; i <= 120; i++) {
                            sender1.sendMessage("");
                        }
                        sender1.sendMessage(replace(plugin.getConfig().getString("Message.ClearAllChat")));
                    }
                }
            } else {
                sendHelp(sender);
            }
        }
        return true;
    }
}
 

Spoiler: onEnable()

Code (Java):

package me.tozymc.chatpro;

import me.tozymc.chatpro.cmds.ChatProCmd;
import me.tozymc.chatpro.cmds.ClearChatCmd;
import me.tozymc.chatpro.listeners.ChatLock;
import org.bukkit.Bukkit;
import org.bukkit.plugin.java.JavaPlugin;

public final class ChatPro extends JavaPlugin {
    public boolean chat;

    public void onEnable() {
        Bukkit.getServer().getPluginManager().registerEvents(new ChatLock(), this);
        this.getConfig().options().copyDefaults(true);
        this.getConfig().addDefault("Chat", true);
        this.getConfig().addDefault("Prefix", "&3&lChatPro &7» ");
        this.getConfig().addDefault("Message.NoPerms", "&cYou not have permission to do this!");
        this.getConfig().addDefault("Message.ChatLock", "Chat has &c&lLOCK&7!");
        this.getConfig().addDefault("Message.ChatUnLock", "Chat has &a&lUNLOCK&7!");
        this.getConfig().addDefault("Message.ChatLocked", "&cChat has locked!");
        this.getConfig().addDefault("Message.ClearChat", "Chat has cleaned!");
        this.getConfig().addDefault("Message.ClearAllChat", "All chat has cleaned!");
        this.saveConfig();
        getCommand("chatpro").setExecutor(new ChatProCmd());
        getCommand("clearchat").setExecutor(new ClearChatCmd());

    }

    public void onDisable() {
    }
}

I have encountered the above error, I spent all day fixing the error, but no way. I think it's related to config! Hope everybody help please! Thank you!

Spigot-api Version: 1.8.8

 

Yes! Thank you very much!