Gruntjs: why compiled scss to empty file? using grunt-contrib-sass plugin - sass

Question

I am trying to compile scss file using the grunt-contrib-sass plugin (with grunt v0.4.0). The compiled result is an empty css file. Below are the base.scss, Gruntfile.js and package.json files.
base.scss
$color: #000;
header{
color: $color;
}
Gruntfile.js
module.exports = function(grunt) {
// Project configuration.
grunt.initConfig({
// Metadata.
pkg: grunt.file.readJSON('package.json'),
sass: {
dist: {
options: { style: "expanded", trace: true },
files: { "base.css": "base.scss" }
}
}
});
grunt.loadNpmTasks('grunt-contrib-sass');
// Default task.
grunt.registerTask("default", [""]);
grunt.registerTask("sass--",["sass"]);
};
package.json
{
"name": "my_grunt",
"version": "1.0.0",
"description": "New to Grunt",
"main": "index.js",
"scripts": {
"test": "test"
},
"repository": {
"type": "git",
"url": "none"
},
"keywords": [
"none"
],
"author": "none",
"license": "BSD",
"devDependencies": {
"grunt-contrib-sass": "~0.2.2"
}
}
Result:
Either I run the sass command "grunt sass" or "grunt sass--", the result is just an empty css file without any errors.
Your help is greatly appreciated
Niusaul

Answer 1

If you haven't installed Grunt globally, you'll either do that or add Grunt as a dependency. Otherwise Grunt won't work.
To install Grunt globally run npm install -g grunt-cli in your Terminal or add as a "devDependency":
"devDependencies": {
"grunt": "0.4.x",
"grunt-contrib-sass": "0.7.x",
}
Edit:
While searching on Google about this problem, I stumpled upon a reported bug on Github from the same user where his problem is solved. Just for everyone who may experienced the same problem, this was his solution:
The error is caused by the manual config that I've set in the Command
Processor (Windows registry), from which I've added an autorun to
change the default command prompt.