Xcode 4 and NimbleKit folder permissions
After installing Xcode 4 and NimbleKit 1.9.6, I could no longer test my apps on the iOS Simulator. Specifically, I was getting errors stating that I didn’t have permission to view various files located in /Library/Frameworks/NimbleKit. When I looked there, this is what I saw (above): a folder with a “do not enter” sign on it.
If you experience this problem, just Get Info for the folder, double click on the lock in the lower right corner (and enter your admin password for your Mac when prompted), and then change Sharing & Permissions for everyone from No access to Read only.