(Is it up to date?) <--- What's wrong with it?

Code:

[00:50:49 ERROR]: Error occurred while enabling TGM v1.0-SNAPSHOT (Is it up to date?)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.rangeCheck(Unknown Source) ~[?:1.8.0_201]
        at java.util.ArrayList.get(Unknown Source) ~[?:1.8.0_201]
        at network.warzone.tgm.map.MapRotationFile.cycle(MapRotationFile.java:31) ~[?:?]
        at network.warzone.tgm.match.MatchManager.cycleNextMatch(MatchManager.java:76) ~[?:?]
        at network.warzone.tgm.TGM.onEnable(TGM.java:111) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:265) ~[patched_1.13.2.jar:git-Paper-605]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:334) ~[patched_1.13.2.jar:git-Paper-605]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:412) ~[patched_1.13.2.jar:git-Paper-605]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugin(CraftServer.java:443) ~[patched_1.13.2.jar:git-Paper-605]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugins(CraftServer.java:357) ~[patched_1.13.2.jar:git-Paper-605]
        at net.minecraft.server.v1_13_R2.MinecraftServer.l(MinecraftServer.java:608) ~[patched_1.13.2.jar:git-Paper-605]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:570) ~[patched_1.13.2.jar:git-Paper-605]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:431) ~[patched_1.13.2.jar:git-Paper-605]
        at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:316) ~[patched_1.13.2.jar:git-Paper-605]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:787) ~[patched_1.13.2.jar:git-Paper-605]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]

What's wrong with it?

 

No, This is not my plugin, but this plugin is open for modification.

 

There is an error in the code, the Imported Library "java.util.ArrayList.rangeCheck" does not exist.
An Imported Library is Function or Variable you import into the Class.

Code:

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

You can then use that imported function or variable to set anything

Code:

public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args)
     {
     if(cmd.getName().equalsIgnoreCase("Kit_Scout") &&sender instanceof Player)
       {
       Scout = true;
       
       Player player = (Player) sender;
       player.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, 1000000, 0, false, false));
       player.addPotionEffect(new PotionEffect(PotionEffectType.JUMP, 1000000, 0, false, false));
       player.setFoodLevel(20);
       
       return true;
       }
     return false;
     }

if the Library import org.bukkit.potion.PotionEffect and import org.bukkit.potion.PotionEffectType was missing then the resulting error would be "PotionEffectType cannot be resolved to a variable"

 

(Is it up to date?) <--- What's wrong with it?
I explained why the Plugin was not working.
at java.util.ArrayList.rangeCheck(Unknown Source), a Library is missing. I stated why the plugin was not working.
"It wants to use something that doesn't exist." is true

 

java.util.ArrayList.rangeCheck(Unknown Source), java.util is a library.
Example: import java.util.function.*;.

The library called "java.util.ArrayList.rangeCheck", while "java.util.ArrayList" is a library. The import "java.util.ArrayList.rangeCheck" does not exist and will give the error "
The import java.util.ArrayList.rangeCheck cannot be resolved"