For the record, another customer discovered that due to some issues with Yarn (some of which are detailed at https://github.com/yarnpkg/yarn/issues/4451), deleting the yarn.lock file worked for him. And make sure you've got the registry set in the npmrc file, like:  registry=https://npm.greensock.com @gsap:registry=https://npm.greensock.com //npm.greensock.com/:_authToken=<token> (Obviously put YOUR unique token in the <token> spot)   That should fix the issue with
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