PHP error when loading 4.5

[treed]

I am building a new machine for the new version of nuBuilder. Info.php runs fine, however when loading the index.php my apache2 log shows this error:
[Tue Jan 12 12:55:21.641634 2021] [php7:error] [pid 7343] [client 192.168.1.17:53316] PHP Fatal error: Uncaught Error: Call to undefined function mb_internal_encoding() in /var/www/html/db/core/nudatabase.php:3\nStack trace:\n#0 /var/www/html/db/core/nuchoosesetup.php(19): require_once()\n#1 /var/www/html/db/index.php(3): require_once('/var/www/html/d...')\n#2 {main}\n thrown in /var/www/html/db/core/nudatabase.php on line 3

I just updated to the latest code and am still receiving this error. Any ideas???

[treed]

Problem resolved, needed to add this to php. This worked for my ubuntu 20.04 server sudo apt-get install php7.4-mbstring