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Unhandled rejection Error: EPERM: operation not permitted cb() never called! (Windows)

Platform info…!

npm: ‘6.4.1’,
ares: ‘1.10.1-DEV’,
cldr: ‘32.0’,
http_parser: ‘2.8.0’,
icu: ‘60.1’,
modules: ‘57’,
napi: ‘3’,
nghttp2: ‘1.32.0’,
node: ‘8.12.0’,
openssl: ‘1.0.2p’,
tz: ‘2017c’,
unicode: ‘10.0’,
uv: ‘1.19.2’,
v8: ‘6.2.414.66’,
zlib: ‘1.2.11’

Do you have write access to that folder?

(I added Windows to the title as we have been having lots of similar sounding Mac/Linux errors, so hopefully get some suggestion from people more familiar with issues on Windows.)