Vertical tabs 2 history issue


Fatal error: Uncaught Error: Call to undefined function theme_icon_value_fallback() in /home/backdemo2017nl/public_html/wp-content/plugins/striking_r_extension/inc/shortcodes/tabs.php:39 Stack trace: #0 /home/backdemo2017nl/public_html/wp-includes/shortcodes.php(343): theme_shortcode_tabs(Array, '\n[tab title="Ta...', 'tabs') #1 [internal function]: do_shortcode_tag(Array) #2 /home/backdemo2017nl/public_html/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(tabs|t...', 'do_shortcode_ta...', '[tabs history="...') #3 /home/backdemo2017nl/public_html/wp-includes/shortcodes.php(177): do_shortcode('[tabs history="...', false) #4 /home/backdemo2017nl/public_html/wp-content/plugins/striking_r_extension/inc/shortcodes/columns.php(9): apply_shortcodes('[tabs history="...') #5 /home/backdemo2017nl/public_html/wp-includes/shortcodes.php(343): theme_shortcode_column('', ' [tabs history=...', 'one_half') #6 [internal function]: do_shortcode_tag(Array) #7 /home/backdemo2017nl/public_html/wp-includes/shortcodes.php(218) in /home/backdemo2017nl/public_html/wp-content/plugins/striking_r_extension/inc/shortcodes/tabs.php on line 39