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Looks like one of your package.json files corrupted:
Diogo Monteiro <diogo.gmtps://github.com/diogogmt)
The missing text is ail.com> (ht was lost when NPM was fetching Mocha-Nightwatch from the repository.
I would delete the file node_modules/.staging/mocha-nightwatch-2017d835/package.json and run npm install again.
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