Support » Fixing WordPress » RSS Reader Feed gives Warning Message

  • Warning: call_user_func_array() []: First argument is expected to be a valid callback, ‘rss_post_thumbnail’ was given in /data/24/2/124/66/2287881/user/2514207/htdocs/wpblog/wp-includes/plugin.php on line 166

    Why does this message show up in Reader feeds? It used to show a brief segment of my blog now I get a warning message.

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  • esmi


    Forum Moderator

    Have you tried:

    – deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).

    – switching to the Twenty Ten theme to rule out any theme-specific problems.

    resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

    – re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress.

    Yikes! All that to figure out which is causing the warning message? I’ll get to work. Thanks on pointing me toward a solution.

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