Have a basic problem with RadSystems standard 8.7.0 missing prereq I think

Questions
1

I was a PHPRad classic user and worked well for me. I just purchased RadSystems Standard 8.7.0 and when I try to publish I get the following error…I am missing somethings . Created new project using PHP Laravel and bootstrap jquery:

PHP Warning: require(C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer/…/symfony/polyfill-mbstring/bootstrap.php): Failed to open stream: No such file or directory in C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer\autoload_real.php on line 41

Warning: require(C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer/…/symfony/polyfill-mbstring/bootstrap.php): Failed to open stream: No such file or directory in C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer\autoload_real.php on line 41
PHP Fatal error: Uncaught Error: Failed opening required ‘C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer/…/symfony/polyfill-mbstring/bootstrap.php’ (include_path=‘C:\xampp\php\PEAR’) in C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer\autoload_real.php:41
Stack trace:
#0 C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer\autoload_real.php(45): {closure}(‘0e6d7bf4a5811bf…’, ‘C:\Users\kjrams…’)
#1 C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\autoload.php(25): ComposerAutoloaderInit6fc24ee6faf05c7fabd217d0708502fd::getLoader()
#2 C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\artisan(18): require(‘C:\Users\kjrams…’)
#3 {main}
thrown in C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer\autoload_real.php on line 41

Fatal error: Uncaught Error: Failed opening required ‘C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer/…/symfony/polyfill-mbstring/bootstrap.php’ (include_path=‘C:\xampp\php\PEAR’) in C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer\autoload_real.php:41
Stack trace:
#0 C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer\autoload_real.php(45): {closure}(‘0e6d7bf4a5811bf…’, ‘C:\Users\kjrams…’)
#1 C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\autoload.php(25): ComposerAutoloaderInit6fc24ee6faf05c7fabd217d0708502fd::getLoader()
#2 C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\artisan(18): require(‘C:\Users\kjrams…’)
#3 {main}
thrown in C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2\vendor\composer\autoload_real.php on line 41

C:\Users\kjramsey\Documents\RadSystems\PHPRad Classic Projects\test2>

2

in laravel you have to clear cache! there is a video on youtube from @willvin that solved this