Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method VWpictureGallery::archive_template() cannot be called statically in /home/www/wordpress/wp-includes/class-wp-hook.php:309 Stack trace: #0 /home/www/wordpress/wp-includes/plugin.php(191): WP_Hook->apply_filters('/home/www/wordp...', Array) #1 /home/www/wordpress/wp-includes/template.php(103): apply_filters('archive_templat...', '/home/www/wordp...', 'archive', Array) #2 /home/www/wordpress/wp-includes/template.php(161): get_query_template('archive', Array) #3 /home/www/wordpress/wp-includes/template-loader.php(81): get_archive_template() #4 /home/www/wordpress/wp-blog-header.php(19): require_once('/home/www/wordp...') #5 /home/www/wordpress/index.php(17): require('/home/www/wordp...') #6 {main} thrown in /home/www/wordpress/wp-includes/class-wp-hook.php on line 309