Kindle Previewer on El Capitan
Did you install El Capitan and now your Kindle Previewer doesn’t work as expected? Are you getting a Java error?
Here’s the solution:
This is one of those errors that has been around for a while but doesn’t happen until you install a new OS (or reinstall one) so it’s hard to remember what the problem is and how to fix it.
Here’s a much more detailed path as described by Amazon:
And, here are more tips for fixing issues caused by upgrade to El Capitan: