Increasability

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Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "html5_blank_view_article" not found or invalid function name in /var/www/html/wp-includes/class-wp-hook.php:324 Stack trace: #0 /var/www/html/wp-includes/plugin.php(205): WP_Hook->apply_filters() #1 /var/www/html/wp-includes/formatting.php(4028): apply_filters() #2 /var/www/html/wp-includes/class-wp-hook.php(324): wp_trim_excerpt() #3 /var/www/html/wp-includes/plugin.php(205): WP_Hook->apply_filters() #4 /var/www/html/wp-includes/post-template.php(434): apply_filters() #5 /var/www/html/wp-content/themes/increasability/functions.php(210): get_the_excerpt() #6 /var/www/html/wp-includes/shortcodes.php(433): wpb_postsbycategory() #7 [internal function]: do_shortcode_tag() #8 /var/www/html/wp-includes/shortcodes.php(273): preg_replace_callback() #9 /var/www/html/wp-content/themes/increasability/single.php(34): do_shortcode() #10 /var/www/html/wp-includes/template-loader.php(106): include('...') #11 /var/www/html/wp-blog-header.php(19): require_once('...') #12 /var/www/html/index.php(17): require('...') #13 {main} thrown in /var/www/html/wp-includes/class-wp-hook.php on line 324