FormAPI not working

Command is not working for FormAPI?

PHP:

<?php


namespace BlawoHD;


use pocketmine\Server;

use pocketmine\plugin\PluginBase;

use pocketmine\event\Listener;

use pocketmine\utils\TextFormat;

use pocketmine\Player;

use pocketmine\command\Command;

use pocketmine\command\CommandSender;

use pocketmine\command\CommandExecutor;

use pocketmine\command\ConsoleCommandSender;


class Main extends PluginBase implements Listener {

   

        public function onEnable() {

        $api = $this->getServer()->getPluginManager()->getPlugin("FormAPI");

        if($api === null){

            $this->getServer()->getPluginManager()->disablePlugin($this);           

        }

        }

   

      public function onCommand(CommandSender $sender, Command $cmd, string $label, array $args) : bool {

        if($cmd->getName() == "dsgvo"){

            if($sender instanceof Player) {

                $api = $this->getServer()->getPluginManager()->getPlugin("FormAPI");

                $form = $api->createModalForm(function (Player $sender, array $data){

                    $result = $data[0];

                   

                    if($result === null){

                        return true;

                    }

                    switch($result){

                           

                    }

                });

                $form->setTitle("DSGVO");

                $form->setContent("Bitte Akzeptiere die Datenschutzrichtlinie des Server!");

                $form->setButton1(TextFormat::GREEN . "Akzeptieren");

                $form->setButton2(TextFormat::DARK_RED . "Ablehnen");

                $form->sendToPlayer($sender);

            }

            break;

        }

        return true;

    }

}


 

it must be ? bool data

PHP:


                $form = $api->createModalForm(function (Player $sender, ? bool $result= null){
                    if($result === null){
                        return true;
                    }

                   if($result) {

                   } else {

                   }

                });


Reffer to: https://github.com/BlockHorizons/FactionsPE/blob/reborn/src/factions/command/LeaveFaction.php#L53