有人用 grunt 么？错误求助： ERROR: f2d_register_rpc() => (null) (-21)

有人用node和grunt么？求助：用grunt的时候出现了这个问题。
2015-03-26 16:15 grunt[5684] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)


module.exports = function (grunt) {
//配置模块参数
grunt.initConfig({
cssmin: {
minify: {
expand: true,
cwd: "/",
src: ["**/*.css","**/!*.min.css"],
dest: "/",
ext: ".min.css"
}
},
jshint: {
options: {
trailing: true
},
files: ["**/*.js"]
},
uglify: {
options: {
sourceMap: true
},
target : {
expand: true,
cwd: 'js/origin',
src : '*.js',
dest : '/'
}
},
watch: {
scripts: {
files: "**/*.js",
tasks: ["jshint","uglify"]
},
css: {
files: "**/*.css",
tasks: ["cssmin"]
}
}
});

require("load-grunt-tasks")(grunt);

grunt.registerTask("default",["watch"]);
};