Something is Error

Hi, Find new error with FormAPI & Myplugin

Spoiler: Error

2020-01-26 [15:03:25] [Server thread/CRITICAL]: Error: "Call to a member function createSimpleForm() on null" (EXCEPTION) in "plugins/ตัวเสริม/src/SkyBlock/Loader/Loader" at line 47
2020-01-26 [15:03:25] [Server thread/DEBUG]: #0 plugins/ตัวเสริม/src/SkyBlock/Loader/Loader(26): SkyBlock\Loader\Loader->Form(object pocketmine\Player)
2020-01-26 [15:03:25] [Server thread/DEBUG]: #1 src/pocketmine/command/PluginCommand(58): SkyBlock\Loader\Loader->onCommand(object pocketmine\Player, object pocketmine\command\PluginCommand, string[4] sbui, array[0])
2020-01-26 [15:03:25] [Server thread/DEBUG]: #2 src/pocketmine/command/SimpleCommandMap(270): pocketmine\command\PluginCommand->execute(object pocketmine\Player, string[4] sbui, array[0])
2020-01-26 [15:03:25] [Server thread/DEBUG]: #3 src/pocketmine/Server(2065): pocketmine\command\SimpleCommandMap->dispatch(object pocketmine\Player, string[4] sbui)
2020-01-26 [15:03:25] [Server thread/DEBUG]: #4 src/pocketmine/Player(2373): pocketmine\Server->dispatchCommand(object pocketmine\Player, string[4] sbui)
2020-01-26 [15:03:25] [Server thread/DEBUG]: #5 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(245): pocketmine\Player->chat(string[5] /sbui)
2020-01-26 [15:03:25] [Server thread/DEBUG]: #6 src/pocketmine/network/mcpe/protocol/CommandRequestPacket(54): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleCommandRequest(object pocketmine\network\mcpe\protocol\CommandRequestPacket)
2020-01-26 [15:03:25] [Server threa

Spoiler: MyFilePlugin

Spoiler: src

Spoiler: Skyblock

Spoiler: Loader

Spoiler: Loader.php

PHP:

<?php
namespace SkyBlock\Loader;

use pocketmine\plugin\PluginBase;
use pocketmine\command\{
Command, CommandSender
};
use pocketmine\{
Player, Server
};
use pocketmine\event\Listener;
use Skyblock\Loader\Commands\CommandTask;
use pocketmine\level\sound\{EndermanTeleportSound , AnvilUseSound, AnvilBreakSound, ClickSound, Sound, FizzSound, PopSound};
 
 class Loader extends PluginBase implements Listener {

    public function onEnable() {
        $this->getServer()->getPluginManager()->registerEvents($this, $this);
        $this->getLogger()->info("SBUI เปิดทำงานแล้ว");
    }
   
    public function onCommand(CommandSender $sender, Command $cmd, string $label, array $args) : bool {
        switch($cmd->getName()){                  
            case "sbui":
                if ($sender instanceof Player){
                     $this->Form($sender);
                }else{    
                     $sender->sendMesseage("§cคำสั่งนี้ใช้ในเกมส์เท่านั้น");
                     return true;
                }    
            break;        
           
         }
        return true;                        
    }
   public function checkDepends(): void{
        $this->formapi = $this->getServer()->getPluginManager()->getPlugin("FormAPI");
        if(is_null($this->formapi)){
            $this->getLogger()->error("SBUI ต้องการ FromAPI ไม่ทำงาน!!");
            $this->getPluginLoader()->disablePlugin($this);
            $skyblockpl = $this->getServer()->getPluginManger()->getPlugin("SkyBlock");
            if(is_null($skyblockpl)){$this->getLogger()->error(" SBUI ต้องการ Skyblock"); $this->getPluginLoader()->disablePlugin($this);}
        }
    }
    public function Form(Player $p) {
    $api = $this->getServer()->getPluginManager()->getPlugin("FormAPI");
        $form = $api->createSimpleForm(function (Player $p, $data){
            $result = $data;
            if($result === null){
                return true;
            }            
            switch($result){
                case 0:
                 $this->getServer()->dispatchCommand($p, "is join");
                   $level->addSound(new EndermanTeleportSound($p));
                break;
                   
                case 1:
                   $this->getServer()->dispatchCommand($p, "is create");
             $level->addSound(new AnvilUseSound($p));
                break;
        case 2:
        $this->DeleteIs($p);
        break;
        case 3:
        $this->Freind($p);
        break;
             
                case  4:
             $p->addTitle("§ลาก่อนนะฮับ");
             $p->addSubTitle("§aคราวหน้า&fมาใหม่");
                   break;
            }
           
           
            });
    $form->setTitle("§l§b | §6S§ck§ay§bb§dl§5o§ec§2k §b|");
      $form->setContent("§l§aกด§dที่§bปุ่ม§eเพื่อ§6ใช้§cฟันชั่ง");
       $form->addButton("§l§6| §aเข้า§eเกาะ §6| \n §f§oกดเพื่อเข้าเกาะ");
       $form->addButton(" §l§a | §f§bสร้าง§dเกาะ §a|  \n§f§oกดเพื่อสร้างเกาะ");
       $form->addButton(" §l§d | §cลบ§4เกาะ §d| \n§f§oกดเพื่อลบเกาะ!");
       $form->addButton(" §l§4| §eเมนู§cเพื่อน §4|\n§f§oกดเพื่อเมนูเกาะ!");
        $form->addButton(" §l§2 | §cออก §2| \n§f§oกดเพื่ออก!");
$form->sendToPlayer($p);                                                        
      }
       public function DeleteIs(Player $p){
        $api = $this->getServer()->getPluginManager()->getPlugin("FormAPI");
        $form = $api->createModalForm(function (Player $p, $data){
            $result = $data;
            if ($result == null) {
            }
            switch ($result) {
                    case 1:
      $this->getServer()->dispatchCommand($p, "is disband");    
       $p->getLevel()->addSound(new AnvilBreakSound($p));
                        break;
                        case 2:
       $p->getLevel()->addSound(new ClickSound($p));
                        break;
            }
        });
       $form->setTitle(" §cลบเกาะ!");
       $form->setContent("คุณแน่ใจหรอที่ต้องการลบเกาะ ถ้าใช่ กด  §l§aใช่ ถ้าไม่กด §l§cไม่ใช้");
       $form->setButton1("§l§d §aใช่ §d|");
       $form->setButton2("§l§a | §cใช่ §a|");
       $form->sendToPlayer($p);
       return $form;
       }
       public function Freind(Player $p){
       $form = $this->getServer()->getPluginManager()->getPlugin("FormAPI")->createSimpleForm(Function (Player $p, $data){
       $result = $data;
       if($result === null){
       return true;
             }
              switch($result){
              case 0:
              $this->InviteFreind($p);
                   $p->getLevel()->addSound(new PopSound($p));
              break;
              case 1:
              $invite = "is acc";
              $this->getServer()->dispatchCommand($p, $invite);
              $p->getLevel()->addSound(new AnvilUseSound($p));
              break;
              case 2:
              $invite = "is d";
              $this->getServer()->dispatchCommand($p, $invite);
       $p->getLevel()->addSound(new AnvilBreakSound($p));
              break;
              }
              });
               $form->setTitle("§l§b | §6S§ck§ay§bb§dl§5o§ec§2k §b|");
                   $form->setContent("§l§aกด§dที่§bปุ่ม§eเพื่อ§6ใช้§cฟันชั่ง");
                   $form->addButton("§l§e | §aเชิญ§bคน§dเข้า§4เกาะ\n§f§oกดเพื่อเชิญคน");
                   $form->addButton(" §l§2 | §aตอบรับคำเชิญ §2| \n§f§oกดเพื่อรับคำเชิญ");
                   $form->addButton("§l§6 | §4ปฎิเสธคำเชิญ §6 | \n§f§oกดเพื่อปฎิเสธ");
                   $form->sendToPlayer($p);
       }
       public function InviteFreind(Player $p){
       $api = $this->getServer()->getPluginManager()->getPlugin("FormAPI");
                       $form = $api->createCustomForm(function (Player $p, $data){  
                           $input = $data[0];
                if($input === null){
                    return true;
                    }
                If(!$input === null){
                $p->sendMessage("§4ได้โปรดใส่ชื่อ");
                            }
                $this->getServer()->dispatchCommand($p, "is invite $input");
        $p->getLevel()->addSound(new ClickSound($p));
  });
                                       $form->setTitle("§l§b | §6S§ck§ay§bb§dl§5o§ec§2k §b|");
                                     
                                       $form->addInput("พิมชื่อตรงนี่: ", "Steve");              
                                       $form->sendToPlayer($p);
                                       }
}

Spoiler: plugin.yml

Code:

name: SbUI
version: 1.0
main: SkyBlock\Loader\Loader
api: [3.0.0]
author: Nutzatvch

commands:
  sbui:
    description:  "เปิดหน้าต่าง"

Thanks you

 

You've not added FormAPI to your server.

 

I add FormAPI to Server But Error https://drive.google.com/file/d/1kwEXs-oYZUw3H_q6ri6WI7Wx6NJnMNwy/view?usp=drivesdk

 

It's not enabled according to the error's sayings.