Recently, when I create a project on Xcode, the build fails and I get this error message:
Couldn't create workspace arena folder '/.../Xcode/DerivedData/program': You don’t have permission to save the file “program” in the folder “DerivedData”.
How to solve it?
Weird, but it happened to me when the disk got almost full. Try to free up some space. For me it solved it.
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