Problem with theme

Hi, i have problem to save and update the website. My provider send me this error and tell me to contact You

[28-Sep-2020 13:28:57 UTC] PHP Fatal error:  Uncaught Error: [] operator not supported for strings in /home/larealestrutture/public_html/wp-content/themes/betheme/functions/builder/back.php:918
Stack trace:
#0 /home/larealestrutture/public_html/wp-content/themes/betheme/functions/meta-portfolio.php(472): mfn_builder_save(2098)
#1 /home/larealestrutture/public_html/wp-includes/class-wp-hook.php(289): mfn_portfolio_save_data(2098)
#2 /home/larealestrutture/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#3 /home/larealestrutture/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#4 /home/larealestrutture/public_html/wp-includes/post.php(4260): do_action('save_post', 2098, Object(WP_Post), true)
#5 /home/larealestrutture/public_html/wp-includes/post.php(4354): wp_insert_post(Array, false)
#6 /home/larealestrutture/public_html/wp-admin/includes/post.php(419): wp_update_post(Array)
#7 /home/larealestrutture/public_html/wp-admin/post.php(227): edit_post()
#8 {main}
  thrown in /home/larealestrutture/public_html/wp-content/themes/betheme/functions/builder/back.php on line 918

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[28-Sep-2020 13:08:41 UTC] PHP Fatal error:  Uncaught Error: [] operator not supported for strings in /home/larealestrutture/public_html/wp-content/themes/betheme/includes/content-single-portfolio.php:47
Stack trace:
#0 /home/larealestrutture/public_html/wp-includes/template.php(732): require()
#1 /home/larealestrutture/public_html/wp-includes/template.php(676): load_template('/home/larealest...', false, Array)
#2 /home/larealestrutture/public_html/wp-includes/general-template.php(204): locate_template(Array, true, false, Array)
#3 /home/larealestrutture/public_html/wp-content/themes/betheme/single-portfolio.php(67): get_template_part('includes/conten...', 'single-portfoli...')
#4 /home/larealestrutture/public_html/wp-includes/template-loader.php(106): include('/home/larealest...')
#5 /home/larealestrutture/public_html/wp-blog-header.php(19): require_once('/home/larealest...')
#6 /home/larealestrutture/public_html/index.php(17): require('/home/larealest...')
#7 {main}
  thrown in /home/larealestrutture/public_html/wp-content/themes/betheme/includes/content-single-portfolio.php on line 47

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