Unable to run vuepress properly

[DanteZii]

I can't install vuepress properly - yarn docs:dev
This is the error message:

#1

 yarn add -D vuepress
yarn add v1.9.4
info No lockfile found.
[1/4] 🔍  Resolving packages...
warning vuepress > css-loader > cssnano > autoprefixer > browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
warning vuepress > css-loader > cssnano > postcss-merge-rules > browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
warning vuepress > css-loader > cssnano > postcss-merge-rules > caniuse-api > browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 📃  Building fresh packages...
success Saved lockfile.
success Saved 683 new dependencies.
info Direct dependencies
└─ vuepress@0.14.1
info All dependencies
├─ @babel/core@7.0.0-beta.47
├─ @babel/helper-builder-binary-assignment-operator-visitor@7.0.0-beta.47
├─ @babel/helper-call-delegate@7.0.0-beta.47
├─ @babel/helper-define-map@7.0.0-beta.47
├─ @babel/helper-explode-assignable-expression@7.0.0-beta.47

#2

yarn run v1.9.4
warning package.json: No license field
$ vuepress dev docs

[meteorlxy]

1. Please don't delete the template when creating an issue.

2. There are only warnings but no error message, and you have already installed vuepress properly.

3. Those warnings are not directly related to vuepress. The first is related to css-loader, and the second it your own business.

4. Add a space between # and 1 to write correct markdown code.

PS: Issue不要乱开，请看清楚要求。另外先去学会yarn/npm这些工具的基础用法。

[xiaomizhou66]

这个是什么意思，怎么解决的，