SASS Build:CSS in Package.json

Hi , im new to coding so i was trying to run the build:css script in my package.json file i end up with the following error msg, i would appreciate if anyone can tell me how to fix it

Input Error: You must pass a valid list of files to parse
npm ERR! errno 1
npm ERR! portfolio@1.0.0 prefix:css: postcss --use autoprefixer -b 'last 10 versions' CSS/style.concat.css -o CSS/style.prefix.css
npm ERR! Exit status 1

"scripts": {
    "watch:sass": "node-sass SASS/main.scss CSS/style.css -w",
    "compile:sass": "node-sass SASS/main.scss CSS/style.comp.css",
    "devserver": "live-server",
    "start": "npm-run-all --parallel devserver watch:sass",
    "concat:css": "concat -o CSS/style.concat.css CSS/style.comp.css",
    "prefix:css": "postcss --use autoprefixer -b 'last 10 versions' CSS/style.concat.css -o CSS/style.prefix.css",
    "compress:css": "node-sass CSS/style.prefix.css CSS/style.css --output-style compressed",
    "build:css": "npm-run-all compile:sass prefix:css compress:css"

  "author": "Mohamed D",

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