运行gulp --watch报错

Question

[21:16:03] Failed to load external module @babel/register
[21:16:03] Requiring external module babel-register
[21:16:04] Using gulpfile E:Demoes6gulpfile.babel.js
[21:16:04] Starting 'build'...
[21:16:04] Starting 'clean'...
[21:16:04] Finished 'clean' after 10 ms
[21:16:04] Starting 'css'...
[21:16:04] Finished 'css' after 13 ms
[21:16:04] Starting 'pages'...
[21:16:04] Finished 'pages' after 21 ms
[21:16:04] Starting 'scripts'...
[21:16:05] Plumber found unhandled error:
Error in plugin "webpack-stream"
Message:

multi ./app/js/index.js

Module not found: Error: Can't resolve 'babel' in 'E:Demoes6'
BREAKING CHANGE: It's no longer allowed to omit the '-loader' suffix when using loaders.

             You need to specify 'babel-loader' instead of 'babel',
             see https://webpack.js.org/migrate/3/#automatic-loader-module-name-extension-removed

resolve 'babel' in 'E:Demoes6'
Parsed request is a module
using description file: E:Demoes6package.json (relative path: .)

resolve as module
  E:\Demo\node_modules doesn't exist or is not a directory
  E:\node_modules doesn't exist or is not a directory
  looking for modules in E:\Demo\es6\node_modules
    using description file: E:\Demo\es6\package.json (relative path: ./node_modules)
      using description file: E:\Demo\es6\package.json (relative path: ./node_modules/babel)
        no extension
          E:\Demo\es6\node_modules\babel doesn't exist
        .js
          E:\Demo\es6\node_modules\babel.js doesn't exist
        .json
          E:\Demo\es6\node_modules\babel.json doesn't exist
        as directory
          E:\Demo\es6\node_modules\babel doesn't exist

[E:Demonode_modules]
[E:node_modules]
[E:Demoes6node_modulesbabel]
[E:Demoes6node_modulesbabel.js]
[E:Demoes6node_modulesbabel.json]
@ multi ./app/js/index.js index[0]
[21:16:05] Version: webpack 4.29.0
Built at: 2019-02-01 21:16:05
1 asset
Entrypoint index = index.js

WARNING in configuration
The 'mode' option has not been set, webpack will fallback to 'production' for this value. Set 'mode' option to 'development' or 'production' to enable defaults for each environment.
You can also set it to 'none' to disable any default behavior. Learn more: https://webpack.js.org/concep...

ERROR in multi ./app/js/index.js
Module not found: Error: Can't resolve 'babel' in 'E:Demoes6'
BREAKING CHANGE: It's no longer allowed to omit the '-loader' suffix when using loaders.

             You need to specify 'babel-loader' instead of 'babel',
             see https://webpack.js.org/migrate/3/#automatic-loader-module-name-extension-removed

@ multi ./app/js/index.js index[0]
[21:16:05] Finished 'scripts' after 931 ms
[21:16:05] Starting 'browser'...
[21:16:05] Starting 'serve'...
livereload[tiny-lr] listening on 35729 ...