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Please read posts here https://groups.google.com/forum/#!forum/react-ui-builder

I'm pretty sure you will find answer there.

I think the issue is permissions. Since the browser is creating and writing to files. I was having this problem and changing the permissions on the target directory to 777 fixed the problem.

Yes, and more obviously, the project directory needs to exist.

You should file an issue on the GitHub repo. That way you're assured the author/contributors will see it :)