Warning: require(D:\laravel\vendor\symfony\polyfill-mbstring\bootstrap.php): failed to open stream: No such file or directory in D:\laravel\vendor\composer\autoload_real.php on line 41

Fatal error: require(): Failed opening required 'D:\laravel\vendor\composer/../symfony/polyfill-mbstring/bootstrap.php' (include_path='.;C:\php\pear') in D:\laravel\vendor\composer\autoload_real.php on line 41