CODE EXAMPLE FOR SHELL

PHP Fatal error: Uncaught Error: Call to undefined function MoontoastMathcadd() in /var/www/html/sms-reporting-portal/vendor/moontoast/math/src/Moontoast/Math/BigNumber.php:506

#change php version with your version
apt install php7.4-bcmath

#nginx 
systemctl restart nginx
#For Apache
systemctl restart apache2