( ! ) Fatal error: Class 'Composer\Installer\LibraryInstaller' not found in /var/www/clients/client0/web4/web/vendor/composer/installers/src/Composer/Installers/Installer.php on line 9
Call Stack
#	Time	Memory	Function	Location
1	0.0000	360960	{main}( )	.../Installer.php:0