Angular2 Final Release - “Error: Angular requires Zone.js prolyfill”

Question

I have upgraded from RC4 to the Final release of Angular2. When I run npm start, the app is stuck on \'Loading...\' the only error I get is about Zone.js:

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Answer 1

This error can also occur when reverting a commit or changing a lot of files and not restarting the development server. Just stop the angular cli server, and try running ng serve again. This solution worked for me, and it wasn't obvious to restart the angular development server at first.