Why has the author Washington Erving fallen out of favor with today's educated readers?

There are many classic writers from the 1800's still being read today but Erving is one of those writers you hear very little of today. I am not well educated on this and the reason for the question but I thought I had read years ago that his books on Washington, Mohamed, etc. fell out of favor because he did not check on the facts. Many educated institutions turned away his biographies because of misinformation that was not discovered till after his death. Is there any truth in this or did I read wrong?

I own a very old complete collection of his writings and I read many very old books all the time. Can I read his account on Washington's life and trust the writer or do I read it and take the story with a grain of salt? I will read the book either way. Thank you for any insight.