@media query not working

Hello,

I get an error when I try compiling @media queries. I cannot figure out what went wrong. Only thing I noticed that in previous versions (now installed version 8.5.0) there is more code in bower.json

Now I have:

{
  "name": "sage",
  "homepage": "https://roots.io/sage/",
  "authors": [
    "Ben Word <ben@benword.com>"
  ],
  "license": "MIT",
  "private": true,
  "dependencies": {
    "bootstrap": "git://github.com/twbs/bootstrap.git#v4.0.0-alpha.4"
  }
}

I Used to have:

{
  "name": "sage",
  "homepage": "https://roots.io/sage/",
  "authors": [
    "Ben Word <ben@benword.com>"
  ],
  "license": "MIT",
  "private": true,
  "dependencies": {
    "bootstrap-sass": "3.3.6",
    "bootstrap-select": "^1.11.2"
  },
  "overrides": {
    "bootstrap-sass": {
      "main": [
        "./assets/stylesheets/_bootstrap.scss",
        "./assets/javascripts/bootstrap/transition.js",
        "./assets/javascripts/bootstrap/alert.js",
        "./assets/javascripts/bootstrap/button.js",
        "./assets/javascripts/bootstrap/carousel.js",
        "./assets/javascripts/bootstrap/collapse.js",
        "./assets/javascripts/bootstrap/dropdown.js",
        "./assets/javascripts/bootstrap/modal.js",
        "./assets/javascripts/bootstrap/tooltip.js",
        "./assets/javascripts/bootstrap/popover.js",
        "./assets/javascripts/bootstrap/scrollspy.js",
        "./assets/javascripts/bootstrap/tab.js",
        "./assets/javascripts/bootstrap/affix.js",
        "./assets/fonts/bootstrap/glyphicons-halflings-regular.eot",
        "./assets/fonts/bootstrap/glyphicons-halflings-regular.svg",
        "./assets/fonts/bootstrap/glyphicons-halflings-regular.ttf",
        "./assets/fonts/bootstrap/glyphicons-halflings-regular.woff",
        "./assets/fonts/bootstrap/glyphicons-halflings-regular.woff2"
      ]
    }
  }
}

The error I get:

Error: Invalid CSS after “e”: expected 1 selector or at-rule, was "e/ Small devices ("*
** on line 1 of assets/styles/common/_global.scss**
>> e/ Small devices (Phones, 480px and up) /
** ^**

I really don’t know where to start. Could something have gone wrong on installing? I work with second edition manual.

What is at:

? That would be a good start for debugging the issue. Or a link to a gist with the whole file. Perhaps even better.