Fatal error: require(): Failed opening required 'C:\xampp\htdocs\slimapp\public../vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\slimapp\public\index.php on line 6 code example

Example: PHP Warning: require(/Applications/Ampps/www/SalesSystem/vendor/composer/../symfony/polyfill-php80/bootstrap.php): failed to open stream: No such file or directory in /Applications/Ampps/www/SalesSystem/vendor/composer/autoload_real.php on line 66

$ composer dump-autoload
  
 #if php artisan not installed, execute following command
$ php artisan install