Css file is not getting generated even after scss is getting compiling successfully - gruntjs

Question

Below is my code of gruntjs css file is not getting generated even after the scss is compiled successfully with no error
I have tried using the different version and i am using the windows 8
Grunt file:
module.exports = function(grunt) {
grunt.initConfig({
pkg: grunt.file.readJSON('package.json'),
concat:{
js:{
src: 'C:/Local_code/js/*.js',
dest: 'C:/Local_code/src/build.js',
reporterOutput:''
},
css: {
src: 'css/*.css',
dest: 'build/main.css'
}
},
autoprefixer:{
dist:{
files:{
'css/foundation.css':'css/foundation.css'
}
}
},
sass: {
dist: {
options: {
compass: true,
sourceMap:true
},
files: [{
expand: true,
cwd: 'C:/Local-code/Scss/',
src: 'C:/Local-code/Scss/*.scss/',
dest: 'C:/Local-code/build/pratik.css',
ext: '.css'
}]
}
},
postcss: {
options: {
map: true,
map: {
inline: false,
annotation: 'dist/css/maps/'
},
processors: [
require('pixrem')(),
//require('autoprefixer')({browsers: 'last 2 versions'}),
require('cssnano')()
]
},
dist: {
src: 'css/*.css'
}
},
})
grunt.loadNpmTasks('grunt-contrib-concat');
grunt.loadNpmTasks('grunt-contrib-sass');
grunt.loadNpmTasks('grunt-postcss'); //The “src” folder will hold your unprocessed CSS files, and PostCSS will write your compiled CSS files into the “dest” folder.
grunt.loadNpmTasks('grunt-contrib-cssmin');
grunt.loadNpmTasks('grunt-contrib-uglify-es');
grunt.loadNpmTasks('grunt-contrib-watch');
//grunt.registerTask('concat-js', ['concat:js']);
grunt.registerTask('default', ['watch']);
//grunt.registerTask('build', ['autoprefixer']);
};
Package.json
{
"name": "project",
"version": "1.0.0",
"description": "Aem Project",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "pratik",
"license": "ISC",
"dependencies": {
"autoprefixer": "^9.6.1",
"compass": "^0.1.1",
"cssnano": "^4.1.10",
"express": "^4.17.1",
"pixrem": "^5.0.0",
"uglify-js": "github:mishoo/UglifyJS2#harmony"
},
"browserslist": [
"last 1 version",
"> 1%",
"maintained node versions",
"not dead"
],
"devDependencies": {
"grunt": "^1.0.4",
"grunt-contrib-concat": "^1.0.1",
"grunt-contrib-cssmin": "^3.0.0",
"grunt-contrib-sass": "^1.0.0",
"grunt-contrib-uglify": "^4.0.1",
"grunt-contrib-uglify-es": "^3.3.0",
"grunt-contrib-watch": "^1.1.0",
"grunt-postcss": "^0.9.0",
"ng-packagr": "^5.3.0",
"uglifyjs-webpack-plugin": "^1.3.0"
}
}
Expected result it should generate the valid css file in destination path.
Actual result css file i not getting generated and no error are coming.