Não consigo Rodar o login: "The origin server did not find a current representation for the target resource or is not willing to disclose that one exists."

Não consigo Rodar o login. Saída :

"The origin server did not find a current representation for the target resource or is not willing to disclose that one exists."

O código está idêntico ao do professor:

package br.com.alura.gerenciador.web;

import java.io.IOException; import java.io.PrintWriter;

import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import br.com.alura.gerenciador.Usuario; import br.com.alura.gerenciador.dao.UsuarioDAO;

@WebServlet(urlPatterns="/login") public class login extends HttpServlet{

private static final long serialVersionUID = 1L;

@Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

String email = req.getParameter("email"); String senha = req.getParameter("senha");

Usuario usuario = new UsuarioDAO().buscaPorEmailESenha(email, senha); PrintWriter writer = resp.getWriter();

if (usuario == null) { writer.println("

}

}