Fatal error: Uncaught Error: Class 'Composer\Installer\LibraryInstaller' not found in C:\xampp\htdocs\site\wp-content\plugins\blockart-blocks\vendor\composer\installers\src\Composer\Installers\Installer.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\site\wp-content\plugins\blockart-blocks\vendor\composer\installers\src\Composer\Installers\Installer.php on line 14