PHP 5.6 to PHP 7.1 error in BeTheme

Hi guys, 

My provider will change all the websites from PHP 5.6 to PHP 7. But if I change it I'll experience some troubles/errors.

Maybe someone can help me with that. First error I discovered was to delete the plugin: Revolution Slider. But still the content isn't been showed.

This is the error right now:
Got error 'PHP message: PHP Fatal error: Uncaught Error: [] operator not supported for strings in /home/g-tail.com/public_html/g-tail.nl/wp-content/themes/betheme/functions/meta-functions.php:3034\nStack trace:\n#0 /home/g-tail.com/public_html/g-tail.nl/wp-content/themes/betheme/page.php(22): mfn_builder_print(2490)\n#1 /home/g-tail.com/public_html/g-tail.nl/wp-includes/template-loader.php(74): include('/home/g-tail.co...')\n#2 /home/g-tail.com/public_html/g-tail.nl/wp-blog-header.php(19): require_once('/home/g-tail.co...')\n#3 /home/g-tail.com/public_html/g-tail.nl/index.php(17): require('/home/g-tail.co...')\n#4 {main}\n thrown in /home/g-tail.com/public_html/g-tail.nl/wp-content/themes/betheme/functions/meta-functions.php on line 3034\n', referer: https://g-tail.nl/nederlandse-marketing-blogs/ 

Who can help me with that? Would be fantastic!

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