title: Invalid Option Error in Grunt
body: <p>Here's my grunt file:</p>
  
  <pre><code>module.exports = function(grunt) {
  'use strict';
  
  grunt.initConfig({
      pkg: grunt.file.readJSON('package.json'),
  
      sass: {
          dist: {
              options: {
                  style: 'compressed'
              },
          files: {
              'public/static/css/&lt;%= pkg.name %&gt;.css': 'public/static/scss/&lt;%= pkg.name %&gt;.scss'
          }
      },
  
      uglify: {
          options: {
              report: 'min'
          },
          files: {
              'public/static/js/&lt;%= pkg.name %&gt;.min.js': 'public/static/js/&lt;%= pkg.name %&gt;.js'
          },
      }
  }
  
  });
  
  grunt.loadNpmTasks('grunt-contrib-sass');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  
  grunt.registerTask('default', ['sass', 'uglify']);
  };
  </code></pre>
  
  <p>But when compiling I get the error:</p>
  
  <pre><code>OptionParser::InvalidOption: invalid option: --report
    Use --trace for backtrace.
  </code></pre>