Warning: require(D:\Apache24\www\qilu\huahai\back-end\vendor\composer/../symfony/polyfill-mbstring/bootstrap.php): Failed to open stream: No such file or directory in D:\Apache24\www\qilu\huahai\back-end\vendor\composer\autoload_real.php on line 41

Fatal error: Uncaught Error: Failed opening required 'D:\Apache24\www\qilu\huahai\back-end\vendor\composer/../symfony/polyfill-mbstring/bootstrap.php' (include_path='.;C:\php\pear') in D:\Apache24\www\qilu\huahai\back-end\vendor\composer\autoload_real.php:41 Stack trace: #0 D:\Apache24\www\qilu\huahai\back-end\vendor\composer\autoload_real.php(45): {closure}('0e6d7bf4a5811bf...', 'D:\\Apache24\\www...') #1 D:\Apache24\www\qilu\huahai\back-end\vendor\autoload.php(25): ComposerAutoloaderInit3375969c6f9e8e4b670e9e851e5fee68::getLoader() #2 D:\Apache24\www\qilu\huahai\back-end\public\index.php(34): require('D:\\Apache24\\www...') #3 {main} thrown in D:\Apache24\www\qilu\huahai\back-end\vendor\composer\autoload_real.php on line 41