Version

3.0.3

Node and OS info

Node v9.3.0 / yarn 1.9.4 / Windows 7

Steps to reproduce

vue ui
the webpage opens, but is blank and loading, open chrome console tab, there is two errors:

1. GET https://unpkg.com/vue-cli-locale-zh-CN 404 ()
2. Network error: Cannot use GraphQLSchema "[object Object]" from another module or realm.

Ensure that there is only one instance of "graphql" in the node_modules
directory. If different versions of "graphql" are the dependencies of other
relied on modules, use "resolutions" to ensure only one version is installed.

https://yarnpkg.com/en/docs/selective-version-resolutions

Duplicate "graphql" modules cannot be used at the same time since different
versions may have different capabilities and behavior. The data from one
version used in the function from another could produce confusing and
spurious results.

What is expected?

open Vue UI

What is actually happening?

blank and loading