grunt serve时报错 Cannot find module 'lodash/assign'

安装了bower install 和 npm install,当npm install时总是有几个WARN

然后我当时没在意,结果等我grunt serve时,报错了:

Loading "Gruntfile.js" tasks...ERROR

Error: Cannot find module 'lodash/assign'
Warning: Task "serve" not found. Use --force to continue.

Aborted due to warnings.

大神help~~~

后来我又copy了一个完整的node_modules

然后运行grunt serve时什么都没有,就像这样:
F:\hand\artemis>grunt serve

F:\hand\artemis>

http://stackoverflow.com/questions/27431187/cannot-find-module-lodash