Grunt手表在转换成css的同时立即停止

我有一个轻微的问题，咕噜，less和文件观看。 我用grunt编译我的较less的代码到压缩的css代码。 我的代码工作正常约一分钟，然后进程不会编译我的less文件，我必须closuresterminal在我的Mac，并再次启动咕噜声进程。 rest后，你会发现我的Gruntfile.js和我的terminal读数。

我希望你能帮助我:)谢谢你的时间！ 最好的祝福！

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Gruntfile.js：

module.exports = function(grunt) { grunt.initConfig({ less: { development: { options: { compress: true, yuicompress: true, optimization: 2 }, files: { "assets/css/style.css": "assets/less/style.less" } } }, watch: { styles: { files: ['assets/**/*.less'], tasks: ['less:development'], options: { nospawn: true } } } }); grunt.loadNpmTasks('grunt-contrib-less'); grunt.loadNpmTasks('grunt-contrib-watch'); grunt.registerTask('default', [ 'less:development', 'watch' ]); }; 

终奌站：

 Running "less:development" (less) task File assets/css/style.css created. Running "watch" task Waiting...OK >> File "assets/less/style.less" changed. Running "less:development" (less) task File assets/css/style.css created. Running "watch" task Completed in 0.012s at Sat Feb 22 2014 23:50:05 GMT+0100 (CET) - Waiting... OK >> File "assets/less/style.less" changed. Running "less:development" (less) task File assets/css/style.css created. Running "watch" task Completed in 0.014s at Sat Feb 22 2014 23:50:21 GMT+0100 (CET) - Waiting... OK >> File "assets/less/style.less" changed. Running "less:development" (less) task File assets/css/style.css created. Running "watch" task Completed in 0.014s at Sat Feb 22 2014 23:50:25 GMT+0100 (CET) - Waiting...