We were moving files in bug 1474414 basically `mv browser/extensions/activity-stream/* browser/components/newtab/` and updating moz.build, etc. A plain artifact build then package results in: IOError: [Errno 2] No such file or directory: '../../dist/Nightly.app/Contents/Resources/browser/features/activity-stream@mozilla.org/chrome/content/common/Actions.jsm' Clobbering first makes it happy.

More of the error: mozilla-central$ ./mach package 0:00.44 /usr/bin/make -C . -j8 -s -w package 0:00.65 make: Entering directory `mozilla-central/obj' 0:00.66 make[1]: Entering directory `mozilla-central/obj/browser/installer' 0:00.70 make[2]: Entering directory `mozilla-central/obj/browser/installer' 0:00.70 make[3]: Entering directory `mozilla-central/obj/browser/installer' 0:03.84 Traceback (most recent call last): 0:03.84 File "mozilla-central/toolkit/mozapps/installer/packager.py", line 339, in <module> 0:03.85 main() 0:03.85 File "mozilla-central/toolkit/mozapps/installer/packager.py", line 333, in main 0:03.85 copier.copy(args.destination) 0:03.85 File "mozilla-central/python/mozbuild/mozpack/copier.py", line 431, in copy 0:03.85 copy_results.append((destfile, f.copy(destfile, skip_if_older))) 0:03.85 File "mozilla-central/python/mozbuild/mozpack/copier.py", line 604, in copy 0:03.85 file.copy(deflater, skip_if_older) 0:03.85 File "mozilla-central/python/mozbuild/mozpack/files.py", line 192, in copy 0:03.85 src = self.open() 0:03.85 File "mozilla-central/python/mozbuild/mozpack/files.py", line 217, in open 0:03.85 return open(self.path, 'rb') 0:03.85 IOError: [Errno 2] No such file or directory: '../../dist/Nightly.app/Contents/Resources/browser/features/activity-stream@mozilla.org/chrome/content/common/Actions.jsm' 0:03.88 make[3]: *** [stage-package] Error 1 0:03.88 make[3]: Leaving directory `mozilla-central/obj/browser/installer' 0:03.88 make[2]: *** [make-package] Error 2 0:03.88 make[2]: Leaving directory `mozilla-central/obj/browser/installer' 0:03.88 make[1]: *** [default] Error 2 0:03.88 make[1]: Leaving directory `mozilla-central/obj/browser/installer' 0:03.88 make: *** [package] Error 2 0:03.88 make: Leaving directory `mozilla-central/obj'