Warning: require_once(vendor/autoload.php): Failed to open stream: No such file or directory in C:\mywamp\sites\allsite\asup4\index.php on line 21

Fatal error: Uncaught Error: Failed opening required 'vendor/autoload.php' (include_path='.;C:\php\pear') in C:\mywamp\sites\allsite\asup4\index.php:21 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\asup4\index.php on line 21