Multi Slider

Fatal error: Uncaught Error: [] operator not supported for strings in /home/customer/www/terragardencenter.com/public_html/wp-content/themes/123garden-1-3-1/123garden/functions/vc/vc_multi_slider.php:170 Stack trace: #0 /home/customer/www/terragardencenter.com/public_html/wp-content/themes/123garden-1-3-1/123garden/functions/vc/vc_multi_slider.php(138): multi_class::multi_callback() #1 /home/customer/www/terragardencenter.com/public_html/wp-includes/shortcodes.php(355): vc_multi_slider_func(Array, '', 'vc_multi_slider') #2 [internal function]: do_shortcode_tag(Array) #3 /home/customer/www/terragardencenter.com/public_html/wp-includes/shortcodes.php(227): preg_replace_callback('/\\[(\\[?)(vc_mul...', 'do_shortcode_ta...', '[vc_text_separa...') #4 /home/customer/www/terragardencenter.com/public_html/wp-content/plugins/js_composer/include/helpers/helpers.php(246): do_shortcode('[vc_text_separa...') #5 /home/customer/www/terragardencenter.com/public_html/wp-content/plugins/js_composer/include/templates/shortcodes/vc_column.ph in /home/customer/www/terragardencenter.com/public_html/wp-content/themes/123garden-1-3-1/123garden/functions/vc/vc_multi_slider.php on line 170