Solved Scoreboard Reload Help!

Help ScoreBoard reload help
(Sorry my English is BAD)

Code:

Code:

    public boolean onCommand(CommandSender send, Command cmd, String label, String[] args) {
        if (cmd.getName().equalsIgnoreCase("start")) {
            new BukkitRunnable() {
                public void run() {
                    for (Player p : Bukkit.getOnlinePlayers()) {
                        if (counttime <= 0) {
                            counttime+=10;
                            p.sendTitle("GameStart", "~~Mob_Attacker~~", 10, 10, 10);
                            sc.mob.setDisplaySlot(DisplaySlot.SIDEBAR);
                            this.cancel();
                        }
                        else {
                            p.sendMessage("GameStart.. " + String.valueOf(counttime) + "");
                            p.playSound(p.getLocation(), Sound.UI_BUTTON_CLICK, 50, 50);
                            counttime--;
                        }
                    }
                    gametime--;
                }
            }.runTaskTimer(instance, 0L, 20L);
            new BukkitRunnable() {
                public void run() {
                    for (Player p : Bukkit.getOnlinePlayers()) {
                        if (gametime == 0) {
                            gametime+=910;
                            sc.mob.setDisplayName("Mob_Attacker");
                            p.sendTitle("GameEnd", "~~Mob_Attacker~~", 10, 10, 10);
                            this.cancel();
                        }
                        else {
                            sc.mob.setDisplayName(String.valueOf((gametime%3600) / 60) + ":" + String.valueOf(gametime % 60));
                            p.setScoreboard(sc.mob.getScore(ChatColor.RED + "Kill User: " + p.getKiller().getName()).getScoreboard());
                            gametime--;
                        }
                    }
                }
            }.runTaskTimer(instance, 0L, 20L);
        }
        return false;
    }
}

Error:

Code:

[23:52:01 WARN]: [Mob_Attacker] Task #24 for Mob_Attacker v0.0.1 generated an exception
java.lang.NullPointerException: null
        at nyanneko.mob.attacker.commands.StartCommand$2.run(StartCommand.java:58) ~[?:?]
        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:76) ~[spigot-1.12.2.jar:git-Spigot-79a30d7-acbc348]
        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:361) [spigot-1.12.2.jar:git-Spigot-79a30d7-acbc348]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:739) [spigot-1.12.2.jar:git-Spigot-79a30d7-acbc348]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot-1.12.2.jar:git-Spigot-79a30d7-acbc348]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot-1.12.2.jar:git-Spigot-79a30d7-acbc348]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot-1.12.2.jar:git-Spigot-79a30d7-acbc348]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_261]

This error line:
p.setScoreboard(sc.mob.getScore(ChatColor.RED + "Kill User: " + p.getKiller().getName()).getScoreboard());

 

@nyanneko0113 A few things can be null:
1. sc
2. mob
3. getScore(...)
4. getKiller()
Those are the only options. Debug if you don't have an idea of which one it is.

 

(Sorry, My English is BAD)

I understood the cause of the error。But I can't Scoreboard Reload

Help Scoreboard Reload

not work scoreboard
not work scoreboard update!!
Help!!

Code:

Code:

 
new BukkitRunnable() {
    public void run() {
        for (Player p : Bukkit.getOnlinePlayers()) {

~~~~~
                          
sc.board.resetScores(String.valueOf((gametime%3600) / 60) + ":" + String.valueOf(gametime % 60));
p.setScoreboard(sc.board);
gametime--;