Fatal error: Uncaught Error: Class 'think\composer\LibraryInstaller' not found in C:\web\hncamp_admin\vendor\topthink\think-installer\src\ThinkFramework.php:9 Stack trace: #0 {main} thrown in C:\web\hncamp_admin\vendor\topthink\think-installer\src\ThinkFramework.php on line 9