After Upgrading 390 Errors and Site No Opening

Today I have update osclass 390 version, but site did started not opening and it records those debugs below;

[29-Dec-2019 21:24:30 Europe/Madrid] PHP Fatal error:  Uncaught Error: Call to undefined function mb_strlen() in /home/xxxxx/domains/mysite.com/public_html/oc-includes/osclass/helpers/hUtils.php:230
Stack trace:
#0 /home/xxxxx/domains/mysite.com/public_html/oc-includes/osclass/functions.php(268): osc_highlight('Adrasan rental ...', 120)
#1 /home/xxxxx/domains/mysite.com/public_html/oc-content/themes/azzurro/common/head.php(28): meta_description()
#2 /home/xxxxx/domains/mysite.com/public_html/oc-includes/osclass/helpers/hDefines.php(244): require('/home/xxxxx/...')
#3 /home/xxxxx/domains/mysite.com/public_html/oc-content/themes/azzurro/header.php(2): osc_current_web_theme_path('common/head.php')
#4 /home/xxxxx/domains/mysite.com/public_html/oc-includes/osclass/helpers/hDefines.php(244): require('/home/xxxxx/...')
#5 /home/xxxxx/domains/mysite.com/public_html/oc-content/themes/azzurro/search.php(64): osc_current_web_theme_path(' in /home/xxxxx/domains/mysite.com/public_html/oc-includes/osclass/helpers/hUtils.php on line 230

I think this is related to a PHP configuration change in your installation but not related to 3.9. Please share your site URL. mb_strlen is a php function which I think is disabled on your current configuration.
Regards

Thanks navjot,
After I changed PHP version to 7,3 version on dashboard of CPANEL , it is solved itself!

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