XF / News Fatal error: Doctrine\Common\Cache\VoidCache ont found in ...../src/XF/CacheFactory.php

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I was attempting an upgrade from 2.2.15 to 2.3 RC2 just now and got the following error early on in the process:

Code:

Fatal error: Uncaught Error: Class "Doctrine\Common\Cache\VoidCache" not found in /usr/www/users/xxxx/yyyyy/src/XF/CacheFactory.php:251 Stack trace: #0 /usr/www/users/xxxx/yyyyy/src/XF/CacheFactory.php(81): XF\CacheFactory->createVoidCache(Array) #1 /usr/www/users/xxxx/yyyyy/src/XF/CacheFactory.php(36): XF\CacheFactory->instantiate('Void', Array) #2...

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