看看我这个错误怎么回事

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            User loginUser = UserService.login(code, pwd);
                // 向session存储登陆用户信息
               HttpSession session = (HttpSession)FacesContext.getCurrentInstance().getExternalContext
                                    ().getSession(false);// .getSession(false);
             session.setAttribute("loginUser", loginUser);
                // 进入下一个页面master
             FacesContext context=FacesContext.getCurrentInstance();
             HttpServletResponse response=(HttpServletResponse)context.getExternalContext().getResponse();
             response.sendRedirect("../main/master.jsf");

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以上是我程序的一段代码，执行后转入到master页面，但是运行报错Cannot forward after response has been committed
各位可知道怎么回事？
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搞定了。。。新页面路径写错了
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