whhats it problem

its the crash:
Packet pocketmine\network\mcpe\protocol\BatchPacket: /njak/Rl0c9ILGaI8J8yJWvKD3OrmQ4/7O/H72JgAAB7NwoU
2020-04-04 [22:14:17] [Server thread/CRITICAL]: ErrorException: "Use of undefined constant has - assumed 'has' (this will throw an Error in a future version of PHP)" (EXCEPTION) in "plugins/hide and seek/src/hide/main" at line 42
2020-04-04 [22:14:17] [Server thread/DEBUG]: #0 plugins/hide and seek/src/hide/main(42): pocketmine\utils\Utils::errorExceptionHandler(integer 2, string[99] Use of undefined constant has - assumed 'has' (this will throw an Error in a fut, string[101] D:\developing and server\pocketmine - mp\PocketMine-MP-stable\plugins\hide and s, integer 42, array[4])
2020-04-04 [22:14:17] [Server thread/DEBUG]: #1 src/pocketmine/command/PluginCommand(58): hide\main->oncommand(object pocketmine\Player, object pocketmine\command\PluginCommand, string[3] has, array[0])
2020-04-04 [22:14:17] [Server thread/DEBUG]: #2 src/pocketmine/command/SimpleCommandMap(270): pocketmine\command\PluginCommand->execute(object pocketmine\Player, string[3] has, array[0])
2020-04-04 [22:14:17] [Server thread/DEBUG]: #3 src/pocketmine/Server(2026): pocketmine\command\SimpleCommandMap->dispatch(object pocketmine\Player, string[3] has)
2020-04-04 [22:14:17] [Server thread/DEBUG]: #4 src/pocketmine/Player(2257): pocketmine\Server->dispatchCommand(object pocketmine\Player, string[3] has)
2020-04-04 [22:14:17] [Server thread/DEBUG]: #5 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(245): pocketmine\Player->chat(string[4] /has)
2020-04-04 [22:14:17] [Server thread/DEBUG]: #6 src/pocketmine/network/mcpe/protocol/CommandRequestPacket(54): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleCommandRequest(object pocketmine\network\mcpe\protocol\CommandRequestPacket)
2020-04-04 [22:14:17] [Server thread/DEBUG]: #7 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(111): pocketmine\network\mcpe\protocol\CommandRequestPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)

and its plugins code:

Code:

 public function oncommand(CommandSender $sender, Command $command, string $label, array $args) : bool{
         switch($command->getname()){
             case "has":
                $this->$sender->getname()->sendmessage("§a§lTeleporting...");
                $chanse = rand(10, 13);
                switch($chanse){
                  case 10: