In my case 'Build Active Architecture Only' in Build settings was set to No both for Release and Debug, but in project.pbxproj ONLY_ACTIVE_ARCH was set to No for Debug, but Yes for Release, I had to correct project.pbxproj manually to get correct output. v.15.0.1
Farquaad
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The problem was solved by adding path to __debug file into the list of project sources.
The problem was solved by removal of all build files in copied project, keeping sources only
I had the same problem with Apple NullDriver Sample project - for test application, calling device extension.
the problem was solved after removal of com.apple.developer.driverkit.userclient-access key from application entitlements
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