I get the above error when I run grunt dist, it worked fine with my other machine. Please find my grunt file.
$ grunt imagemin.
Launching the task "imagemin: png" (imagemin) Miniature 132 images (saved 134.02 kB)
Launching the "imagemin: gif" task (imagemin)
Fatal error: write EPIPE
module.exports = function(grunt) { grunt.initConfig({ pkg: grunt.file.readJSON('package.json'), connect: { server: { options: { port: 9001, livereload: true, hostname: 'localhost', base: ['.'] } } }, watch: { options: { livereload: true }, all: { files: ['Content/**/*.scss'], tasks: 'sass' } }, open: { all: { path: 'http://localhost:9001/app/index.html' } }, concat: { style: { src: [ "Content/font-awesome/css/font-awesome.min.css", "Content/scss/all.scss", "Content/scss/_buttons.scss"], dest: 'Content/dist/scss/style.scss' }, ie: { cwd: 'Content', expand: true, src: [ "scss/ie9.scss", "scss/ie8.scss" ], dest: 'Content/dist' } }, sass: { dist: { options: { style: 'expand', compass: true, }, files: { 'Content/dist/css/style.css': 'Content/dist/scss/style.scss', 'Content/dist/css/ie8.css': 'Content/dist/scss/ie8.scss', 'Content/dist/css/ie9.css': 'Content/dist/scss/ie9.scss' } } }, cssmin: { css:{ files: { 'Content/dist/ie8.css': 'Content/dist/css/ie8.css', 'Content/dist/ie9.css': 'Content/dist/css/ie9.css', 'Content/dist/style.css': 'Content/dist/css/style.css' } } }, imagemin: { png: { files: [{ expand: true, cwd: 'Images/', src: '**/*.png', dest: 'Images/dist/' }] }, gif: { files: [{ expand: true, cwd: 'Images/', src: '**/*.gif', dest: 'Images/dist/' }] }, ico: { files: [{ expand: true, cwd: 'Images/', src: '**/*.ico', dest: 'Images/dist/' }] }, jpg: { files: [{ expand: true, cwd: 'Images/', src: '**/*.jpg', dest: 'Images/dist/' }] }, jpeg: { files: [{ expand: true, cwd: 'Images/', src: '**/*.jpeg', dest: 'Images/dist/' }] } }, clean: { build : { src: ['Content/dist/', 'Images/dist', 'Scripts/dist'] }, scss: { src: ['Content/dist/scss', 'Content/dist/css'] }, map: { src: 'Content/dist/css/*.map' }, js: { src: ['Scripts/temp'] } }, compass: { dist: { options: { sassDir: 'app/sass', cssDir: 'Content/dist/css' } } } }); grunt.loadNpmTasks('grunt-contrib-clean'); grunt.loadNpmTasks('grunt-contrib-compass'); grunt.loadNpmTasks('grunt-contrib-concat'); grunt.loadNpmTasks('grunt-contrib-uglify'); grunt.loadNpmTasks('grunt-contrib-connect'); grunt.loadNpmTasks('grunt-contrib-cssmin'); grunt.loadNpmTasks('grunt-contrib-imagemin'); grunt.loadNpmTasks('grunt-contrib-sass'); grunt.loadNpmTasks('grunt-contrib-watch'); grunt.loadNpmTasks('grunt-open'); grunt.registerTask('server', function() { grunt.task.run([ 'connect', 'open', 'watch' ]); }); grunt.registerTask('dist', 'Running the minification job for production', function() { grunt.task.run([ 'clean:build', 'concat', 'sass', 'cssmin', 'imagemin', 'clean:scss', 'clean:js' ]); }); };