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Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method social_facebook_ftgssbfw::register() cannot be called statically in /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-includes/class-wp-hook.php:324 Stack trace: #0 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #1 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-includes/plugin.php(517): WP_Hook->do_action() #2 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-includes/widgets.php(1862): do_action() #3 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-includes/class-wp-hook.php(324): wp_widgets_init() #4 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #5 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-includes/plugin.php(517): WP_Hook->do_action() #6 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-settings.php(695): do_action() #7 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-config.php(170): require_once('/homepages/1/d4...') #8 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-load.php(50): require_once('/homepages/1/d4...') #9 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-blog-header.php(13): require_once('/homepages/1/d4...') #10 /homepages/1/d411844504/htdocs/rt-aranjuez/blog/index.php(17): require('/homepages/1/d4...') #11 {main} thrown in /homepages/1/d411844504/htdocs/rt-aranjuez/blog/wp-includes/class-wp-hook.php on line 324