当我从xcode 4.3.2升级到4.5.2时出现错误

Question

我有Mac OS X v10.7.5 Lion.我正在尝试安装Ruby 1.9.3.在做的过程中,我刚刚下载了xcode 4.5.2来取代4.3.2.但是当我这样做时,我得到以下错误.我该如何解决这个问题？

提前致谢.

The operation can’t be completed because some items had to be skipped. For each item, 
choose File > Get Info, make sure “Locked” is deselected, and then check the Sharing & 
Permissions section. When you are sure the items are unlocked and not designated as 
Read Only or No Access, try again.

Answer 1

我发现我首先需要删除旧的并在应用程序中添加新的.