How to add PurePerms player's group as placeholder?

[dvodany]

Hi,
For many hours I tried to find a solution to make my PurePerms rank appear in the chat, but I can't. I don't know what to do with it and that's why I'm contacting you because I'm just a beginner in php. I hope you understood my question, if you need to specify anything, ask me. If I ask on the wrong page, I apologize in advance.

Code:

(use CortexPE \ HRKChat \ event \ PlaceholderResolveEvent; is more in the other code which if you want I can send too. I wrote the whole code in the GroupJoin plugin, I hope it doesn't matter)
/**
* @param PlaceholderResolveEvent $ev
*
* @priority LOWEST
*/

 public function onPlaceholderResolve(PlaceholderResolveEvent $ev, Player $player): void {
  	
  	if($ev->getPlaceholderName() === "PureChat.players.Rank") {

  			$ev->setValue((string)$ev->getUserDataMgr()->getGroup($player)->getName());
  	}
  }     

HRKChat config.yml:

chatFormat:

1: " &3[&6{{myPlugin.player.latency}}&3]§r §7[Member]§r &7{{hrk.displayName}} {{PurePerms.players.Rank}} &8> &7{{msg}}"
2: " &3[&6{{myPlugin.player.latency}}&3]§r §l§6[§l§4Admin§l§6]§r &7{{hrk.displayName}} {{PurePerms.players.Rank}} &8>
&7{{msg}}"
3: " &3[&6{{myPlugin.player.latency}}&3]§r {{PurePerms.players.Rank}} &7{{hrk.displayName}} test &8> &7{{msg}}"

And this was shown in the console:

[Server] dvodany has joined to server!
[21:06:08] [Server thread/INFO]: The admin dvodany joined the server.
[21:06:10] [Server thread/ERROR]: [HRKChat] Unresolved placeholder 'PurePerms.players.Rank'
[21:06:10] [Server thread/INFO]: [21] [Admin] dvodany NULL > Test

From left to right:
Ping
Rank
Name
PurePerms rank
Message

I am sorry for my bad English.