HELP: Unhandled exception executing command

Code:

Spyrootje issued server command: /acraft
[18:18:29 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'acraft' in plugin AutoCrafter v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:646) ~[spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1351) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1186) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_102]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_102]
        at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:732) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:400) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:668) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:567) [spigot.jar:git-Spigot-90f61bc-83a9dbd]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_102]
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
        at spyrootje.craftstick.onCommand(craftstick.java:22) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-90f61bc-83a9dbd]
        ... 15 more

im getting the error as shows above and i have no idea what the problem is, i only get it when executing /acraft but not when i do /acraft claim or flag

 

@spyrootjenl

That is the problem. Make sure that you are not trying to use indexes of arrays that are greater than the array's length.

In this case, the array causing the exception has a length of 0.

 

Player player = (Player) sender;
if(!(sender instanceof Player)) {
sender.sendMessage("You need to be a player to execute that command");
return true;

}
if (args[0] == null) {
player.sendMessage("Usage = /acraft <item>");
}
else if (args[0].equalsIgnoreCase("claim")) {
player.sendMessage("Usage = /acraft <item>claimnn");
}
else if (args[0].equalsIgnoreCase("flag")) {
player.sendMessage("Usage = /acraft <item>flagmm");
}
else {
player.sendMessage(".... is not a correct item name!");
}
This is the code, i cant find a error, can you help?

 

@spyrootjenl
Don't check if "args[0]" equals null. Check args.length instead.