title: Grunt aborted due to warnings
body: <p>I have already installed "npm" on my local machine. In my Gruntfile.js directory, i'm installing grunt in this way:</p>
  
  <blockquote>
    <ol>
    <li>npm install grunt</li>
    <li>npm install -g grunt-cli</li>
    <li>grunt watch</li>
    </ol>
  </blockquote>
  
  <p>The tasker is running, but i got these warnings:
  <a href="https://i.stack.imgur.com/Y0FVK.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Y0FVK.jpg" alt="enter image description here"></a></p>
  
  <p>Here's my gruntfile.js file</p>
  
  <pre><code>module.exports = function (grunt) {
      grunt.initConfig({
          pkg: grunt.file.readJSON('package.json'),
  
          sass: {
              dist: {
                  options: {
                      style: 'compact',
                      cacheLocation: 'assets/sass/.cache-location',
                  },
                  files: [{
                      'assets/css/dx-epb-admin.css': 'assets/css/scss/dx-epb-admin.scss',
                      'assets/css/dx-epb-public.css': 'assets/css/scss/dx-epb-public.scss',
                      'assets/css/dx-epb-grid.css': 'assets/css/scss/dx-epb-grid.scss',
                  }],
              },
          },
  
          autoprefixer:{
              dist: {
                  files: {
                      'assets/css/dx-epb-admin.css': 'assets/css/dx-epb-admin.css',
                      'assets/css/dx-epb-admin-new.css': 'assets/css/dx-epb-admin-new.css',
                      'assets/css/dx-epb-public.css': 'assets/css/dx-epb-public.css',
                      'assets/css/dx-epb-grid.css': 'assets/css/dx-epb-grid.css',
                  },
              },
          },
  
          watch: {
              scripts: {
                  files: ['assets/js/src/*.js'],
                  tasks: ['jshint', 'uglify'],
              },
              css: {
                  files: [ 'assets/css/**/*.scss', 'assets/css/*.css' ],
                  tasks: ['sass', 'autoprefixer', 'cssmin'],
              },
          },
  
          cssmin: {
              options: {
                  shorthandCompacting: false,
                  roundingPrecision: -1
              },
              target: {
                  files: {
                      'assets/css/dx-epb-admin.min.css': ['assets/css/dx-epb-admin.css'],
                      'assets/css/dx-epb-admin-new.min.css': ['assets/css/dx-epb-admin-new.css'],
                      'assets/css/dx-epb-public.min.css': ['assets/css/dx-epb-public.css'],
                      'assets/css/dx-epb-grid.min.css': ['assets/css/dx-epb-grid.css'],
                  }
              }
          },
  
          uglify: {
              target: {
                  files: {                    
                      'assets/js/dx-epb-admin.min.js':
                      [
                          'assets/js/src/dx-epb-admin.js',
                      ],
                      'assets/js/dx-epb-admin-new.min.js':
                      [
                          'assets/js/src/dx-epb-admin-new.js',
                      ],
                      'assets/js/dx-epb-admin-save.min.js':
                      [
                          'assets/js/src/dx-epb-admin-save.js',
                      ],
                      'assets/js/dx-epb-control.min.js':
                      [
                          'assets/js/src/dx-epb-control.js',
                      ],
                      'assets/js/dx-epb-media-upload.min.js':
                      [
                          'assets/js/src/dx-epb-media-upload.js',
                      ],
                      'assets/js/dx-epb-public.min.js':
                      [
                          'assets/js/src/dx-epb-public.js',
                      ],
                      'assets/js/dx-epb-tinymce-button.min.js':
                      [
                          'assets/js/src/dx-epb-tinymce-button.js',
                      ]
                  }
              }
          },
  
          jshint: {
              all: ['Gruntfile.js', 'assets/js/scripts.js'],
          },
      });
  
      grunt.loadNpmTasks('grunt-sass');
      grunt.loadNpmTasks('grunt-contrib-watch');
      grunt.loadNpmTasks('grunt-contrib-jshint');
      grunt.loadNpmTasks('grunt-contrib-cssmin');
      grunt.loadNpmTasks('grunt-autoprefixer');
      grunt.loadNpmTasks('grunt-contrib-uglify');
  
      grunt.registerTask('default', ['watch']);
      grunt.registerTask('css', ['sass', 'autoprefixer']);
      grunt.registerTask('minify', ['cssmin']);
      grunt.registerTask('minifyjs', ['uglify']);
  };
  </code></pre>