Solved Beacon API not working

Hi! I've got another question.
Following the instructions here: https://bukkit.org/threads/util-beacon-blockstate-api-sort-of.164451/ by foodlying, but I whenever I try to convert to a BeaconState, the command line says
Caused by: java.lang.NoClassDefFoundError: Could not initialize class go.SuperCraft.me.BeaconState
Here is my Main class:

Code:

import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffectType;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Beacon;
import org.bukkit.block.Block;
import org.bukkit.command.Command;
import go.SuperCraft.me.ItemSmith;

public class Main extends JavaPlugin {
       @Override
        public void onEnable() {
         
           PluginManager pm=getServer().getPluginManager();
           ListenerOne listener= new ListenerOne(this);
           pm.registerEvents(listener, this);
        }
       @Override
        public void onDisable() {
          
        }
       public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){
           Player player= (Player) sender;
           if (sender instanceof Player){
               String lowerCmd= cmd.getName().toLowerCase();
          
           switch(lowerCmd){
           case "givebeacon":
               if(player.hasPermission("op")){
                   player.sendMessage(ChatColor.translateAlternateColorCodes('&', "OP is working"));
                   player.sendMessage(ChatColor.translateAlternateColorCodes('&', "aToNull is working"));
                   Block b=new ItemSmith().BuildBlock(Material.BEACON, player, player.getLocation().add(1, 0, 0));
                  
                   player.sendMessage(ChatColor.translateAlternateColorCodes('&', "B is working"));
                   BeaconState state=BeaconState.asBeacon(b);

                   player.sendMessage(ChatColor.translateAlternateColorCodes('&', "ItemSmith is working"));
                   state.setPrimary(PotionEffectType.BLINDNESS);
                   state.setSecondary(PotionEffectType.UNLUCK);
               }
                  
          
           }}
              
           return true;
       }
}

Item/Block Creation Class:

Code:

import java.util.ArrayList;
import java.lang.reflect.Method;
import java.lang.reflect.Field;
import java.lang.reflect.Constructor;

import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.data.BlockData;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemFlag;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.BlockDataMeta;
import org.bukkit.inventory.meta.ItemMeta;

public class ItemSmith {

public ItemSmith(){}   
public ItemStack BuildItem(Material m, String name, String desc, Boolean enchants, Boolean Attributes){
    ItemStack item=new ItemStack(m);
    ItemMeta im= item.getItemMeta();
    im.setDisplayName(name);
    ArrayList<String> lore= new ArrayList<String>();
    lore.add(desc);
    im.setLore(lore);
   
if(!Attributes){
    im.addItemFlags(ItemFlag.HIDE_ATTRIBUTES);}
    if(!enchants){
    im.addItemFlags(ItemFlag.HIDE_ENCHANTS);}
    item.setItemMeta(im);

return item;
}
public Block BuildBlock(Material m, Player player, Location loc){
    Block block = loc.getBlock();
    player.sendMessage(ChatColor.translateAlternateColorCodes('&', "dddd is working"));
    block.setType(m);
     player.sendMessage(ChatColor.translateAlternateColorCodes('&', "ooooo is working"));
    /*BlockDataMeta im = null;
    im.setDisplayName(name);
    ArrayList<String> lore= new ArrayList<String>();
    lore.add(desc);
    im.setLore(lore);
   
if(!Attributes){
    im.addItemFlags(ItemFlag.HIDE_ATTRIBUTES);}
    if(!enchants){
    im.addItemFlags(ItemFlag.HIDE_ENCHANTS);}*/

return block;
}

}

 

@timtower Yes, I have a java file with the API code inside of my package where I keep my scripts.

@timtower never mind. I just realized that I can just prevent the player from opening up the GUI. My main goal at first was to negate all effects.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

@Niv-Mizzet Never worked with beaconapi, so I don't know. But I just wanted to mention that if you want to check if a player is op, you should do if p.isOp()

 

@robertlit Thanks