[R] download problem!

[Qu, Xianggui (Harvey)]

Hi,
I recently had trouble downloading R contributed packages, such as acepack.
When I saved acepack.zip to my R library,  extracted it and went back to R
and type "library(acepack)", I got the following warning

Package  `acepack' contains no R code in: library(acepack) 

Could you please tell me the reason?

Thank you very much!

Xianggui Qu.
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