Plugin Help :)

Hello!, we have been working on a ShopUI plugin and we cannot figure out why it is not working.

When we start the server it gives no errors and enables and when we run /shop in-game the UI shows but you cannot click anything any ideas?
please help

PHP:

<?php
 
namespace AlexPads\Shop\TinyPixelDevz;
 
 use pocketmine\command\{Command, CommandSender};
 use pocketmine\item\Item;
 use pocketmine\Player;
 use pocketmine\plugin\PluginBase;
 use pocketmine\utils\TextFormat;
 
 class Main extends PluginBase{
 
     private $economyapi;
     private $formapi;
 
     public $weapons = [];
     public $tools = [];
     public $armor = [];
     public $blocks = [];
     public $specials = [];
     public $masks = [];
 
     public $category;
 
     public function onEnable()
     {
         foreach (['FormAPI', 'EconomyAPI'] as $depend) {
             $plugin = $this->getServer()->getPluginManager()->getPlugin($depend);
             $name = strtolower($depend);
             if (is_null($plugin)) {
                 $this->getLogger()->error($depend . " is required to use this plugin.");
                 $this->setEnabled(false);
                 return false;
             }
             $this->$name = $plugin;
         }
         $this->saveDefaultConfig();
         foreach (["weapons", "tools", "armor", "blocks", "specials", "masks"] as $category) {
             $this->$category = $this->getConfig()->getNested("items." . $category);
         }
         $this->getLogger()->info("ShopUI By TinyPixelDevz Team!");
     }
 
    public function onCommand(CommandSender $sender, Command $cmd, string $label,array $args) : bool {
    
        switch ($cmd->getName()) {
            case "shop":
                if ($sender instanceof Player) {
                    $this->mainForm($sender);
                    return true;
                 }
                 $sender->sendMessage(TextFormat::RED . "Please use this in-game.");
                 break;
         }
         return true;
     }
 
     public function mainForm(Player $player)
     {
               $api = $this->getServer()->getPluginManager()->getPlugin("FormAPI");
               $form = $api->createCustomForm(function (Player $sender, array $data = null){
                 $result = $data[0];
              if ($result === null){
                 $categories = [0 => "weapons", 1 => "tools", 2 => "armor", 3 => "blocks", 4 => "specials", 5 => "masks"];
                 switch ($result) {
                     case 6:
                         return;
                     default:
                         $this->categoryForm($player, $categories[$result]);
                         $this->category[$player->getLowerCaseName()] = $categories[$result];
                         return;
                 }
             }
         });
 
         $form->setTitle(TextFormat::WHITE . "--= " . TextFormat::BOLD . TextFormat::GREEN . $this->getConfig()->getNested("name") . TextFormat::RESET . TextFormat::WHITE . " =--");
         $money = $this->economyapi->myMoney($player->getName());
         $form->setContent("Your Money: $" . $money);
         $form->addButton(TextFormat::WHITE . "Weapons");
         $form->addButton(TextFormat::WHITE . "Tools");
         $form->addButton(TextFormat::WHITE . "Armour");
         $form->addButton(TextFormat::WHITE . "Blocks");
         $form->addButton(TextFormat::WHITE . "Special Items");
         $form->addButton(TextFormat::WHITE . "Masks");
         $form->addButton(TextFormat::GREEN . "Exit");
         $form->sendToPlayer($player);
     }
 
     public function categoryForm(Player $player, $category){
               $api = $this->getServer()->getPluginManager()->getPlugin("FormAPI");
               $form = $api->createCustomForm(function (Player $sender, array $data = null){
                 $result = $data[0];
              if ($result === null){
                 $category = $this->category[$player->getLowerCaseName()];
                 if ($data[0] < count($this->$category)) {
                     $item = $this->$category[$data[0]];
                     $values = explode(":", $item);
                     $money = $this->economyapi->myMoney($player->getName());
                     if ($money >= $values[4]) {
                         $player->getInventory()->addItem(Item::get($values[0], $values[1], $values[2])->setCustomName($values[3]));
                         $this->economyapi->reduceMoney($player, $values[4]);
                         $message = $this->getConfig()->getNested("messages.bought");
                         $tags = [
                             "{amount}" => $values[2],
                             "{item}" => $values[3],
                             "{cost}" => $values[4]
                         ];
                         foreach ($tags as $tag => $replacement){
                             $message = str_replace($tag, $replacement, $message);
                         }
                         $player->sendMessage($message);
                     } else {
                         $message = $this->getConfig()->getNested("messages.not-enough-money");
                         $tags = [
                             "{amount}" => $values[2],
                             "{item}" => $values[3],
                             "{missing}" => $values[4] - $money
                         ];
                         foreach ($tags as $tag => $replacement){
                             $message = str_replace($tag, $replacement, $message);
                         }
                         $player->sendMessage($message);                    }
                 } else {
                     $this->mainForm($player);
                 }
             }
        });
        $form->setTitle(ucfirst($category));
        $money = $this->economyapi->myMoney($player->getName());
        $form->setContent("§a§lYour Money: " . $money);
        foreach ($this->$category as $item) {
            $values = explode(":", $item);
            $form->addButton($values[3] . " : " . $values[4], isset($values[5]) ? $values[5] : -1, isset($values[6]) ? str_replace("https//", "https://", $values[6]) : "");
        }
        $form->addButton("§bBack to main menu!");
        $form->sendToPlayer($player);
    }
  }