Title: one source trows an error Last modified: May 23, 2019 --- # one source trows an error * Resolved [oekoplatt](https://wordpress.org/support/users/oekoplatt/) * (@oekoplatt) * [7 years ago](https://wordpress.org/support/topic/one-source-trows-an-error/) * Hi folks, * thank you for the plugin. I have a strange problem: One of 5 sources ([https://www.klimareporter.de/feed/rss/](https://www.klimareporter.de/feed/rss/)) give me in feed preview the error “Invalid feed URL – Double check the feed source URL setting above.” However the feed validator show “Congratulations! This is a valid RSS feed.” Debug-log: “Failed to fetch the feed from [https://www.klimareporter.de/feed/rss/](https://www.klimareporter.de/feed/rss/). Error: The resource could not be retrieved because of a client error with code 403 Server returned 2626 characters, of which 150 are below: