Fatal error: Uncaught Error: Class "Composer\Installer\LibraryInstaller" not found in /home/ccmobileslide/public_html/think/vendor/topthink/think-installer/src/ThinkExtend.php:18 Stack trace: #0 {main} thrown in /home/ccmobileslide/public_html/think/vendor/topthink/think-installer/src/ThinkExtend.php on line 18