Error: 500 Internal Server Error

Sorry, the requested URL 'http://localhost/reader?url=https://www.rockymounttelegram.com/news/world/polls-open-in-kenyan-presidential-election-said-to-be-tight/article_8369d65b-7e9c-599f-85f4-ed12adef5fa1.html' caused an error:

Unhandled exception