Please provide us with the following information:

Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)

Please run ng --version. If there's nothing outputted, please run in a Terminal: node --version and paste the result here:

Was this an app that wasn't created using the CLI? What change did you do on your code? etc.

Normally this include a stack trace and some more information.

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Thanks! We'll be in touch soon.