连接并尝试显示我通过console.log获取此错误消息（错误）
{UserExistsError：具有给定用户名的用户已在Promise.resolve.then.then.then注册（/Users/rprater/Desktop/Hephaestus/EasyU/node_modules/passport-local-mongoose/index.js:238:17）名称：'UserExistsError'，消息：'具有给定用户名的用户已注册'}
这是我用来获取它的代码，
router.post（“/ register”，function（req，res）{
var firstName = titleize(req.body.firstName).trim();
var lastName = titleize(req.body.lastName).trim();
User.register(new User({
firstName: firstName,
lastName: lastName,
username: req.body.username,
university: req.body.university
}), req.body.password, function(err, user){
if(err){
// console.log(err.message);
req.flash("error", err.message);
return res.render("registration");
}
//This will log the user in and store the correct information
passport.authenticate("local")(req, res, function(){
req.flash("success", "Welcome to EasyU" + " " + user.firstName);
res.redirect("homePage");
});
});
});
请记住，所有其他类型的错误（例如未显示密码时）都会在网站上显示并显示 .
先谢谢你了 . :)