Bug Class "Doctrine\Common\Cache\MemcachedCache" not found

[rkxh]

Code:

PHP Fatal error:  Uncaught Error: Class "Doctrine\Common\Cache\MemcachedCache" not found in /home/saabforum/src/XF/Cache/MemcachedCache.php:9
Stack trace:
#0 /home/saabforum/src/vendor/composer/ClassLoader.php(576): include()
#1 /home/saabforum/src/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('...')
#2 /home/saabforum/src/XF/CacheFactory.php(197): Composer\Autoload\ClassLoader->loadClass('...')
#3 /home/saabforum/src/XF/CacheFactory.php(81)...

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