WP HTTP Error: cURL error 60: Peer's Certificate issuer is not recognized.

WP HTTP Error: 有効な URL ではありません。

A feed could not be found at http://www.player.jp/musicradar/atom.xml. A feed with an invalid mime type may fall victim to this error, or SimplePie was unable to auto-discover it.. Use force_feed() if you are certain this URL is a real feed.