Until this is released a manual workaround is to run `mkdir -p ~/.mozbuild/moz-phab` (this should work on MacOS, Linux, and withing mozilla-build on Windows).
Bug 1616467 Comment 4 Edit History
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Until this is released a manual workaround is to run `mkdir -p ~/.mozbuild/moz-phab` (this should work on MacOS, Linux, and within mozilla-build on Windows).