Solved Getting player name from Steam ID?

I am having trouble converting SteamId to Player Name ..
Can you help me?

 

Where I put this VAR

Code:

namespace Oxide.Plugins
{
    [Info("Inventory Cleaner", "PaiN", "1.1.3", ResourceId = 0)]
    [Description("This plugin allows players with permission to clean all/their/target's inventory.")]
    class InventoryCleaner : RustPlugin
    {          
        void Loaded() => permission.RegisterPermission(this.Name.ToLower()+".use", this);
        [ChatCommand("Limparinvtodos")]
        void cmdInvCleanAll(BasePlayer player, string cmd, string[] args)
        {
            string steamId = Convert.ToString(player.userID);
            if (permission.UserHasPermission(steamId, "inventorycleaner.use"))
            {
                if (args.Length == 1)
                {
                    SendReply(player, "Digite: <color='#007FFF'>/limparinvtodos</color>\n~Para limpar inventario de todos jogadores");
                    return;
                }
              
                    var players = BasePlayer.activePlayerList as List<BasePlayer>;
                    foreach (BasePlayer current in BasePlayer.activePlayerList)
                    {
                        current.inventory.Strip();
                        Puts(player.displayName + " Você limpou todos os inventarios!");
                        PrintToChat("<color=orange>[Limpeza]</color> " + player.displayName + " limpou o inventario de todos: (" + players.Count + ") !");
                        SendReply(player, "<color=orange>[Limpeza]</color> " + "Você limpo o inventario dos seguintes jogadores: " + players.Count + "");
                  
                    }
                  
                }
                else
                {
                    SendReply(player, "Você nao tem permissao para usar este comando!");
                    return;      
                }
            }

 

But when I type there is no game the command it says so no console

Code:

Failed to call hook 'cmdInvClean' on plugin 'InventoryCleaner v1.1.3' (NullReferenceException: Object reference not set to an instance of an object)

LOG

Code:

19:20 [Stacktrace]   at Oxide.Plugins.InventoryCleaner.cmdInvClean (.BasePlayer player, System.String cmd, System.String[] args) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.InventoryCleaner.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00000] in <filename unknown>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (HookMethod method, System.Object[] args) [0x00000] in <filename unknown>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x00000] in <filename unknown>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00000] in <filename unknown>:0 

 

Code:

var trajeto = BasePlayer.FindPlayer(steamId);

ERROR

Code:

Error while compiling InventoryCleaner.cs(60,30): error CS0117: `BasePlayer' does not contain a definition for `FindPlayer'

 

Because when I type the command in the chat it does not clean the player's inventory.

Ex:

Code:

/limparinv "Theusz"

Does not clean the player inventory and error in the console.
Only works if I enter the player ID, if I enter the Name does not work