I am trying to update my CleverSoft theme and I receive this in command line when I run this:

php bin/magento setup:di:compile

enter image description here


I was having the same problem in Magento 2.1.8.

I solved the problem by cloning the latest version of the repository GitHub and copying the 'Serialize' package to version 2.1.8.

Path: <magento_path>/lib/internal/Magento/Framework/Serialize/

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