E-ERROR plugin failed

I am having an issue and not sure how to fix. I got the white screen of death today and can only get my website working by going into recovery mode and disabling the Data Table plugin. Below is the error message but not sure what to do to make it work. I have a about 20 tables and cant even export the data to try it on another plugin.

An error of type E_ERROR was caused in line 21 of the file /home/signarc/tarfgroup.com.au/wp-content/plugins/data-tables-generator-by-supsystic/vendor/Rsc/Autoloader.php. Error message: Uncaught Error: Call to undefined function mb_stripos() in /home/signarc/tarfgroup.com.au/wp-content/plugins/data-tables-generator-by-supsystic/vendor/Rsc/Autoloader.php:21 Stack trace: #0 /home/signarc/tarfgroup.com.au/wp-content/plugins/data-tables-generator-by-supsystic/app/SupsysticTables.php(21): RscDtgs_Autoloader::load() #1 /home/signarc/tarfgroup.com.au/wp-content/plugins/data-tables-generator-by-supsystic/index.php(57): SupsysticTables->__construct() #2 /home/signarc/tarfgroup.com.au/wp-settings.php(453): include_once(‘/home/signarc/t…’) #3 /home/signarc/tarfgroup.com.au/wp-config.php(79): require_once(‘/home/signarc/t…’) #4 /home/signarc/tarfgroup.com.au/wp-load.php(50): require_once(‘/home/signarc/t…’) #5 /home/signarc/tarfgroup.com.au/wp-login.php(12): require(‘/home/signarc/t…’) #6 {main} thrown