bower install的时候出现的问题。

[shizhidi]

bower extract ionic#v1.0.0-beta.14 archive.tar.gz
bower invalid-meta ionic is missing "main" entry in bower.json
bower invalid-meta ionic is missing "ignore" entry in bower.json
bower EPERM EPERM, unlink 'C:\Users\ADMINI~1\AppData\Local\Temp\W61-2013
0902QAR-Administrator\bower\ionic-1940-N9zPzr\archive.tar.gz'

Stack trace:
Error: EPERM, unlink 'C:\Users\ADMINI~1\AppData\Local\Temp\W61-20130902QAR-Admin
istrator\bower\ionic-1940-N9zPzr\archive.tar.gz'
请明白的说一下，大概啥意思。