uglifier and concat grunt plugins don't work togheter

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i am wondering what is wrong with my grunfile.js file

module.exports = function(grunt) {

    // 1. All configuration goes here 
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),

        concat: {   
    dist: {
        src: [
            'js/libs/*.js', // All JS in the js folder
            'js/global.js',

        ],
        dest: 'js/production/production.js',
    }
}

uglify: {
    build: {
        src: 'js/production/production.js',
        dest: 'js/production/production.min.js'
    }
}



    });

    // 3. Where we tell Grunt we plan to use this plug-in.
    grunt.loadNpmTasks('grunt-contrib-concat', 'grunt-contrib-uglify');


    // 4. Where we tell Grunt what to do when we type "grunt" into the terminal.
   grunt.registerTask('default', ['concat', 'uglify']);

};

i keep having this error: "Task uglify not found. use --force to continue."

i'm following coyer's tutorial (http://ift.tt/1pZsOV0) but i can't figure out how to add a chunk of code AFTER another.

the concat plugin works alone, but as i add the uglify one, i get the error. it's probably syntax but i can't figure it out (i moved the code around, repeated the whole block etc.) nothing works.

thanks for your help!

asked 1 min ago

vlrprbttst

525