angular-seed SCSS error

[altipla-developer1]

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[ x] bug report => search github for a similar issue or PR before submitting
[ ] feature request
[ ] support request => Please do not submit support request here, instead see use [gitter](https://gitter.im/mgechev/angular2-seed) or [stackoverflow](https://stackoverflow.com/questions/tagged/angular2)

Current behavior

I'm following the guide (Working with SASS)[https://github.com/mgechev/angular-seed/wiki/Working-with-SASS] and the following error throws.

[12:53:07] Starting 'build.html_css'... TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type object at assertPath (path.js:39:11) at Object.dirname (path.js:1268:5) at Object.importer (/home/alobaton/workspace/GOSTOCK/gostock-web/angular-seed/node_modules/node-sass-magic-importer/src/index.ts:92:32) at options.importer (/home/alobaton/workspace/GOSTOCK/gostock-web/angular-seed/node_modules/node-sass/lib/index.js:336:31)

Expected behavior

Compile with out problems.

Please tell us about your environment:

SO: Ubuntu 18.04.1 LTS 64 Bits
RAM: 11,1 GiB
Processor: AMD® A10-9600p radeon r5, 10 compute cores 4c+6g × 4

• Angular Seed Version: aaaaf75
  latest
• Node: node --version =
  v10.13.0

[ArminZol]

Just to confirm: have you changed all the CSS files to SCSS, still reference all the files as .css from your ts files, and enabled SCSS (for example you can set 'this.ENABLE_SCSS = true;' in your project.config.ts file)