Error: 500 Internal Server Error

Sorry, the requested URL 'http://localhost/reader?url=https://%E0%B8%9C%E0%B8%A5%E0%B8%B4%E0%B8%95%E0%B8%A0%E0%B8%B1%E0%B8%93%E0%B8%91%E0%B9%8C%E0%B8%81%E0%B8%B1%E0%B8%8D%E0%B8%8A%E0%B8%B2.com/' caused an error:

Unhandled exception