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