Hello,
It seems we can’t generate aliases and more outputs like “amp” together. Here is how to reproduce the problem :
hugo new site blog
cd blog
hugo new _index.md
Modify content/_index.md to remove draft and add aliases :
---
title: "Home"
date: 2018-08-20T18:53:31+02:00
aliases: ["/oldindex.html"]
---
hugo command works as expected : the public directory is created.
Add this in config.toml :
[outputs]
home = ["HTML", "AMP"]
hugo command says :
Error: Error building site: open /home/jeff/tmp/blog/public/oldindex.html/amp/index.html: not a directory
hugo version is : Hugo Static Site Generator v0.47.1 linux/amd64 BuildDate: 2018-08-20T12:56:04Z