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Go to the Folder in Finder where the xcode project is and right click -> Get info. The permissions and the bottom should be set to read/write and in my case they were. The trick is to click the settings icon at the bottom and select "Apply to enclosed items".
I use Xcode6 GM. I encountered the same problem. What I did was to go to Build Settings -> Build Options. Then I changed the value of the "Compiler for C/C++/Objective-C" to Default Compiler.
The other solutions only fixed it for me on simulator, not device.
For me this problem occurred (in Xcode 6) when I would try to change the main info.plist properties whilst trying to change my app name.
In info.plist I had changed Executable File name to something other than the default ${EXECUTABLE_NAME}...
I had mistaken this field for the field that changes the name of the app under the icon on the springboard.
In Xcode do the following
Window --> Organiser --> Projects --> The app with the issue --> delete button in Derived Data.
I then cleaned the project and voila
works
For me, a simple Product -> Clean worked great
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