D:\Projects\mallspk>grunt serve
Running "serve" task

Running "clean:server" (clean) task
>> 0 paths cleaned.

Running "wiredep:app" (wiredep) task

Running "wiredep:test" (wiredep) task

Running "wiredep:sass" (wiredep) task

Running "concurrent:server" (concurrent) task
    Warning: Running "compass:server" (compass) task
Warning: Command Failed: 'compass.bat' is not recognized as an internal or exter
nal command,operable program or batch file.
     Use --force to continue.

我已经安装Yo角和运行以下命令：

npm install grunt --save-dev
npm install -g grunt-contrib-compass 
npm install -g compass
npm install
bower install
npm install  grunt-google-cdn

并且当我运行命令grunt服务我有这个错误。我有最新的节点和npm安装与最新的咕噜和哟。