require(vendor/function.php): Failed to open stream in laravel

I have installed laravel recently via composer but in browser it shows these errors

Warning: require(D:\xampp\htdocs\laravel-8.x\vendor\composer/../symfony/deprecation-contracts/function.php): failed to open stream: No such file or directory in D:\xampp\htdocs\laravel-8.x\vendor\composer\autoload_real.php on line 69

Fatal error: require(): Failed opening required 'D:\xampp\htdocs\laravel-8.x\vendor\composer/../symfony/deprecation-contracts/function.php' (include_path='D:\xampp\php\PEAR') in D:\xampp\htdocs\laravel-8.x\vendor\composer\autoload_real.php on line 69

via Chebli Mohamed