Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method WP_Feed_Cache::create() cannot be called statically in /home/fumihen/www/playmusic/wp-includes/SimplePie/Registry.php:215
Stack trace:
#0 /home/fumihen/www/playmusic/wp-includes/class-simplepie.php(1466): SimplePie_Registry->call()
#1 /home/fumihen/www/playmusic/wp-content/plugins/feedwordpress/feedwordpress.php(1958): SimplePie->init()
#2 /home/fumihen/www/playmusic/wp-content/plugins/feedwordpress/syndicatedlink.class.php(102): FeedWordPress::fetch()
#3 /home/fumihen/www/playmusic/wp-content/plugins/feedwordpress/syndicatedlink.class.php(141): SyndicatedLink->fetch()
#4 /home/fumihen/www/playmusic/wp-content/plugins/feedwordpress/feedwordpress.php(900): SyndicatedLink->poll()
#5 /home/fumihen/www/playmusic/wp-content/plugins/feedwordpress/feedwordpress.php(1621): FeedWordPress->update()
#6 /home/fumihen/www/playmusic/wp-includes/class-wp-hook.php(307): FeedWordPress->auto_update()
#7 /home/fumihen/www/playmusic/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#8 /home/fumihen/www/playmusic/wp-includes/plugin.php(476): WP_Hook->do_action()
#9 /home/fumihen/www/playmusic/wp-settings.php(620): do_action()
#10 /home/fumihen/www/playmusic/wp-config.php(95): require_once('...')
#11 /home/fumihen/www/playmusic/wp-load.php(50): require_once('...')
#12 /home/fumihen/www/playmusic/wp-blog-header.php(13): require_once('...')
#13 /home/fumihen/www/playmusic/index.php(17): require('...')
#14 {main}
thrown in /home/fumihen/www/playmusic/wp-includes/SimplePie/Registry.php on line 215
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