I can not install frondend page module

[richardgong1987]

I can not install backend page module, which webpack version you did?

the error output:

ERROR in .//css-loader?{"sourceMap":false,"importLoaders":1}!.//postcss-loader!.//sass-loader!./src/scss/styles.scss
Module build failed:
@import '../../node_modules/@angular/material/core/theming/all-theme';
^
File to import not found or unreadable: ../../node_modules/@angular/material/core/theming/all-theme.
Parent style sheet: stdin
in /Users/richard.g/Documents/workspace/loopbackCMS/backend/src/scss/styles.scss (line 2, column 1)
@ ./src/scss/styles.scss 4:14-204
@ multi .//quill/dist/quill.snow.css ./src/scss/styles.scss