Ionic scss: gulp sass error "File to import not found or unreadable" slides

I am getting an error when I run gulp sass. The error is about a missing scss file which should have been there as part of the framework (_slides.scss)

Here is my ionic info:
$ ionic info

Your system information:

Cordova CLI: Not installed
Gulp version: CLI version 3.9.1
Gulp local: Local version 3.9.1
Ionic Framework Version: 1.3.1
Ionic CLI Version: 2.0.0
Ionic App Lib Version: 2.0.0
OS: /bin/sh: lsb_release: command not found
Node Version: v6.0.0

And here is the error:
$ gulp sass
[06:59:25] Using gulpfile ~/public_html/my/QBapp/circleApp/gulpfile.js
[06:59:25] Starting ‘sass’…
Error in plugin 'sass’
Message:
www/lib/ionic/scss/ionic.scss
Error: File to import not found or unreadable: slides
Parent style sheet: /home/ec2-user/public_html/my/QBapp/circleApp/www/lib/ionic/scss/ionic.scss
on line 3 of www/lib/ionic/scss/ionic.scss

@import
^

[06:59:25] Finished ‘sass’ after 106 ms
[ec2-user@ip-172-31-17-207 circleApp]$

Here is the ionic.scss

@charset “UTF-8”;

@import
// Ionicons
"ionicons/ionicons.scss",

// Variables
"mixins",
“variables”,

// Base
"reset",
“scaffolding”,
“type”,

// Components
"action-sheet",
“backdrop”,
“bar”,
“tabs”,
“menu”,
“modal”,
“popover”,
“popup”,
“loading”,
“items”,
“list”,
“badge”,
“slide-box”,
“slides”,
“refresher”,
“spinner”,

// Forms
"form",
… [snipped]

What am I missing? How do I fix this?

Thanks.

Did you run ionic setup sass?
When yes then ->
Delete all inside the lib folder and run bower install

hope that helps

Thanks,
Daniel