autoload.php on line 20

hi i try install it but show me :

Warning: require(C:\xampp\htdocs\acc\bootstrap/../vendor/autoload.php): Failed to open stream: No such file or directory in C:\xampp\htdocs\acc\bootstrap\autoload.php on line 20

Fatal error: Uncaught Error: Failed opening required 'C:\xampp\htdocs\acc\bootstrap/../vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\acc\bootstrap\autoload.php:20 Stack trace: #0 C:\xampp\htdocs\acc\index.php(18): require() #1 {main} thrown in C:\xampp\htdocs\acc\bootstrap\autoload.php on line 20

my info :

Apache/2.4.54 (Win64) OpenSSL/1.1.1p PHP/8.1.10
Database client version: libmysql - mysqlnd 8.1.10
PHP extension: mysqli Documentation curl Documentation mbstring Documentation
PHP version: 8.1.10