我试图在我的应用程序中实现身份验证。但是，应用程序在注册用户时抛出无法设置标头错误。我无法理解为什么通过错误处理函数“wrapAsync”会抛出此错误。

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at new NodeError (node:internal/errors:387:5)
    at ServerResponse.setHeader (node:_http_outgoing:603:11)
    at ServerResponse.header (/Users/alisha/Desktop/Oshi/node_modules/express/lib/response.js:794:10)
    at ServerResponse.send (/Users/alisha/Desktop/Oshi/node_modules/express/lib/response.js:174:12)
    at done (/Users/alisha/Desktop/Oshi/node_modules/express/lib/response.js:1035:10)
    at /Users/alisha/Desktop/Oshi/node_modules/ejs-mate/lib/index.js:356:7
    at tryHandleCache (/Users/alisha/Desktop/Oshi/node_modules/ejs/lib/ejs.js:280:5)
    at Object.exports.renderFile (/Users/alisha/Desktop/Oshi/node_modules/ejs/lib/ejs.js:491:10)
    at View.renderFile [as engine] (/Users/alisha/Desktop/Oshi/node_modules/ejs-mate/lib/index.js:298:7)
    at View.render (/Users/alisha/Desktop/Oshi/node_modules/express/lib/view.js:135:8)

以下是我的代码块：
1. /注册路由：

router.post('/register', wrapAsync(async(req,res)=>{
    const {username, email, nearestLocation, phoneNum, password, RePassword}= req.body;
    if(password !== RePassword) {
        req.flash('error', 'Please retype same password for confirmation')
        return res.redirect('/firm/register')
    }
    
        const hashpw= await bcrypt.hash(password, 12);
        const registerBusiness= new Businesses({
            username: username, email: email, location: nearestLocation, phoneNum: phoneNum,   password: hashpw})
        await registerBusiness.save();
        req.session.currentAccount= registerBusiness.id;
        req.session.currentAccountName = registerBusiness.username;
        req.flash('success', 'Successfully registered your Business account')
        return res.redirect('/home')
}))

2. wrapAsync模块：

module.exports = (fn)=>{
    return ((req,res,next)=>{
        fn(req,res,next).catch(next)
    })
}

有人能给我解释一下这个错误吗？
我希望此代码块为请求发送一个响应。但是，似乎并非如此，而且我也无法确定第二个响应是如何发送的。请帮助我查找答案...