Warning: Task "wiredep" not found

[oxy-code]

I'm a noobie using this grunt-wiredep and I tried to setup this from the scratch project structure. Here I posted my Gruntfile code. Please correct me if anything I'm wrong here. Thanks in advance

module.export = function(grunt){
    grunt.loadNpmTasks('grunt-wiredep');
    grunt.initConfig({
        wiredep: {
            app:{src: 'index.html'},
            task: {
                // Point to the files that should be updated when
                // you run `grunt wiredep`
                src: [
                  'bower-components/**/*.css',   // .html support...
                  'bower-components/**/*.js',   // .jade support...
                  //'app/styles/main.scss',  // .scss & .sass support...
                ],

                options: {
                  // See wiredep's configuration documentation for the options
                  // you may pass:
                  // https://github.com/taptapship/wiredep#configuration
                }
              }
        }

    })

};