Invoke error messages: returned callback(new Error('some message')) always printing {}

[nealshail]

By default JSON.stringify(new Error(‘some error message’)) will always print {}. In order to get a comprehensive error message we need to specifiy which properties of the error message to print out.

see this article for more details https://stackoverflow.com/questions/18391212/is-it-not-possible-to-stringify-an-error-using-json-stringify