No match found for location with path "/"

求解，在搭建脚手架的时候使用 vue-router4.0 结果出了警告。查阅了一下，大多都说 name 重复了。我尝试给我几个路由都增加了不相同的 name 也是一样报错。求解！！！
固定的路由：
export const constantRoutes = [
{
path: "/login",
meta: {
title: "用户登录",
},
name: "login",
component: "/login",
hidden: true,
},
{
path: "/404",
meta: {
title: "404",
},
name: "404",
component: "/error/404",
hidden: true,
},
{
path: "/demo1",
meta: {
title: "测试 1",
},
name: "demo1",
hidden: true,
component: "BasicLayout",
children: [
{
path: "/demo3",
meta: {
title: "测试 3",
},
name: "demo3",
hidden: true,
component: "/setting",
},
],
},
];

下面两个是动态添加的两个
{
path: "/:pathMatch(.*)",
redirect: "/404",
name: "test",
},
{
path: "/",
redirect: "/demo1",
name: "test1",
},