Why coffee and iPhone development don’t mix

I’ve been having strange warning messages appear in my project every time I add a new class for quite a while now – I had hoped upgrading to XCode 4 would resolve the problem, but unfortunately it did not.
The error message that occurs is this:
[WARN]warning: no rule to process file '$(PROJECT_DIR)/Project.xcodeproj/ProjectHeader.h' of type sourcecode.objj.h for architecture i386
As it turns out, it actually was nothing to do with XCode itself, rather my choice of coffee…
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