All of a sudden my project fails to build in Xcode. If I look at the log I see all the needed dependencies being built, and then I get a strange error:
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None of these answers worked for me on XCode 5.
Luckily, I'm still only testing XCode 5 - I kept XCode 4 around.
XCode 5 simply won't build one of my two projects, claiming that my libraries aren't built with the right settings, and I keep running into the error described on this page on the other one... so I'm sticking with XCode 4, which builds both of my projects perfectly well.
If you are experiencing this issue on XCode 5, consider "reverting to XCode 4" as another strategy.
Overall the idea that repeatedly running a program, XCode or not, degrades your system to the point where you have to reboot does not fill me with confidence in that program.