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I am getting the following error when running "gulp serve" command after scaffolding the basic Hello World web-part project. I have installed the latest versions of Node LTS v6.9.5 and TypeScript 2.1.6 as showing in the image below:
It looks like an issue with your path having a ! in it. Can you start with a directory called SPFX, rather than !SPFX?
Required, but never shown