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Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method Widget_Custom_tax_tag_cloud::register() cannot be called statically in /www/htdocs/w009bb74/blogs/wp-includes/class-wp-hook.php:324 Stack trace: #0 /www/htdocs/w009bb74/blogs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #1 /www/htdocs/w009bb74/blogs/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #2 /www/htdocs/w009bb74/blogs/wp-includes/widgets.php(1870): do_action('widgets_init') #3 /www/htdocs/w009bb74/blogs/wp-includes/class-wp-hook.php(324): wp_widgets_init('') #4 /www/htdocs/w009bb74/blogs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #5 /www/htdocs/w009bb74/blogs/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #6 /www/htdocs/w009bb74/blogs/wp-settings.php(700): do_action('init') #7 /www/htdocs/w009bb74/blogs/wp-config.php(124): require_once('/www/htdocs/w00...') #8 /www/htdocs/w009bb74/blogs/wp-load.php(50): require_once('/www/htdocs/w00...') #9 /www/htdocs/w009bb74/blogs/wp-blog-header.php(13): require_once('/www/htdocs/w00...') #10 /www/htdocs/w009bb74/blogs/index.php(17): require('/www/htdocs/w00...') #11 {main} thrown in /www/htdocs/w009bb74/blogs/wp-includes/class-wp-hook.php on line 324