Error: "There is no argument matching the required formal parameter", what is the reason?

Question

C++ / C#

The first file contains the following code:

public class PlayerCons
{

  protected Guid m_connectionId;
  protected string m_playerName;

  public Guid ConnectionId { get { return m_connectionId; } }
  public string PlayerName { get { return m_playerName; } }

    public PlayerCons(string _playerName, Guid _connectionId)
  {
    m_playerName = _playerName;
    m_connectionId = _connectionId;
  }
}

In another, like this:

public static void Msg_ws(string message, SomeInterface connection,List<PlayerCons> Connects)
    {
      string[] splitMessage = message.Split(':');

      switch (splitMessage[0])
      {
        case "MyName": SetName(splitMessage,Connects,connection); break;
      }

public static void SetName(string[] splitMessage, List<PlayerCons> Connects, SomeInterface connection)
    {
      var Id = connection.Id;
      string _name = splitMessage[1];
      Connects.Add(new PlayerCons { _playerName = _name, _connectionId = Id });
      //ошибки:
      //PlayerCons не содержит определение для "_playerName"
      //PlayerCons не содержит определение для "_connectionId"
      //Отсутствует аргумент, соответствующий требуемому формальному параметру "_playerName" из "PlayerConnect.PlayerConnect(string, Guid)".
    }

And in the main file, such an instance of the sheet is created:

public static void Main(string[] args)
    {
      var m_playerCons = new List<PlayerCons>();
    }

I studied the error, but it often refers to a problem with class inheritance, but I don’t inherit anything here, but the error occurs for some reason. How to decide?
PS If I do such an operation directly, not with the help of third-party methods, then everything works, but with the methods there is some kind of error unknown to me.

Answer 1

new PlayerCons( _name, Id)
or

new PlayerCons() {PlayerName = _name, ConnectionId = Id}

Answer 2

You have 1 constructor, with specified overload
add

public PlayerCons(){}
и
new PlayerCons { _playerName = _name, _connectionId = Id }

or write
new PlayerCons( _name, Id)