Xcode fails without specifying and errors

Question

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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Answer 1

I rebooted, no luck. Then I noticed that when I relaunched XCode, one of my tabs was loaded with no file in it. I figured out what file I was editing in it, opened it, saved it and then I was able to build.