I read he explanation, and I commanded this in my Windows PC.
yarn create vuepress-site twtwtw-gj-site
Then, The file twtwtw-gj-site/package.json doesn't exist.
The file twtwtw-gj-site/docs/package.json exists. And, in docs directory, I commanded yarn dev and sacceeded.
It confused me. The main directory should be twtwtw-gj-site.
https://vuepress.vuejs.org/guide/getting-started.html#manual-installation
I read he explanation, and I commanded this in my Windows PC.
Then, The file twtwtw-gj-site/package.json doesn't exist. The file twtwtw-gj-site/docs/package.json exists. And, in docs directory, I commanded
yarn dev
and sacceeded. It confused me. The main directory should be twtwtw-gj-site.