Warning: include(vendor/autoload.php): failed to open stream: No such file or directory in D:\xampp\htdocs\flutter_api\vendor\google\crc32\tests\CRC32Test.php on line 18

Warning: include(): Failed opening 'vendor/autoload.php' for inclusion (include_path='D:\xampp\php\PEAR') in D:\xampp\htdocs\flutter_api\vendor\google\crc32\tests\CRC32Test.php on line 18

Fatal error: Class 'PHPUnit\Framework\TestCase' not found in D:\xampp\htdocs\flutter_api\vendor\google\crc32\tests\CRC32Test.php on line 26