Warning: mysqli :: __ construct (): (HY000 / 2002)

Hello colleagues, please, if you can help me, give me the following error.

 Warning: mysqli::__construct(): (HY000/2002): Solo se permite un uso de cada 
 direcci�n de socket (protocolo/direcci�n de red/puerto) in C:\wamp64\www\OnlineVentas\com.modelo.conexion\conexion.php on line 12

my connection is like this

          <?php /* dbconnect.inc.php */

            function Conectarse() 
            { 
              $mysqli = new mysqli('localhost', 'root', '1234', 'tienda');
              $mysqli->set_charset("utf8");
              return $mysqli;

            } 
              $link=Conectarse();
        ?>

Reading an earlier article, I did it like that

        <?php /* dbconnect.inc.php */

   define("DB_HOST", "localhost");
   define("DB_USERNAME", "root");
   define("DB_PASSWORD", "1234");
   define("DB_NAME", "tienda");
   define("DB_ENCODE", "utf8");

   function Conectarse() 
    { 
      // $mysqli = new mysqli('localhost', 'root', '1234', 'tienda');
       $conexion=new mysqli (DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME);
       mysqli_query($conexion, "SET NAMES'".DB_ENCODE."'");

       if(mysqli_connect_errno()){
 printf("fallo mijin:", mysqli_connect_errno());

 exit();
     }
      return $conexion;

     } 
       $link=Conectarse();
     ?>

Still the error follows if you can help me please