¿A dónde ir y cuándo?

Fatal error: Uncaught Error: Cannot use object of type WP_Error as array in /homepages/40/d251715402/htdocs/muestramecuba_network/wordpress/wp-content/plugins/rssfeedreader-mix-client/rssfeedreader-mix-client.php:47 Stack trace: #0 /homepages/40/d251715402/htdocs/muestramecuba_network/wordpress/wp-includes/shortcodes.php(319): rssfeedreader_mix_shortcode('http://rss.digi...', '', 'rssfeedreader-m...') #1 [internal function]: do_shortcode_tag(Array) #2 /homepages/40/d251715402/htdocs/muestramecuba_network/wordpress/wp-includes/shortcodes.php(197): preg_replace_callback('/\\[(\\[?)(rssfee...', 'do_shortcode_ta...', '<p>Si de opcion...') #3 /homepages/40/d251715402/htdocs/muestramecuba_network/wordpress/wp-includes/class-wp-hook.php(286): do_shortcode('<p>Si de opcion...') #4 /homepages/40/d251715402/htdocs/muestramecuba_network/wordpress/wp-includes/plugin.php(203): WP_Hook->apply_filters('<p>Si de opcion...', Array) #5 /homepages/40/d251715402/htdocs/muestramecuba_network/wordpress/wp-includes/post-template.php(240): apply in /homepages/40/d251715402/htdocs/muestramecuba_network/wordpress/wp-content/plugins/rssfeedreader-mix-client/rssfeedreader-mix-client.php on line 47