I just upgraded to 2.0.5 and get the following error in apache log.

PHP Fatal error: Class 'cms/block' not found in /vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php on line 97

  • after migrare you have to just run command php bin/magento setup:upgrade to setup your existing module – Rakesh Jesadiya May 11 '16 at 8:45

Looks like you have custom modules or themes or widget that refer to old M1 block name. Remove it and error will gone

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