$ng serve
And some of the properties in my libraries are changed to [Exception: ZoneAwareError]
What is that mean ?
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http://stackoverflow.com/questions/41246184/exception-typeerror-cannot-set-property-message-of-undefined – Radonirina Maminiaina Mar 15 '17 at 10:57
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You might have an older version of nodejs. Check with `ng v` and upgrade if it's lower then [required](https://github.com/angular/angular-cli#prerequisites). – Sasxa Mar 15 '17 at 11:08