After running
composer require magento/product-community-edition 2.2.0 --no-update
composer update
I ran
bin/magento setup:upgrade
But while running this command I get the following error:
Updating modules:
Unable to unserialize value.
[InvalidArgumentException]
Unable to unserialize value.
I read that multiple developers had this problem after upgrading to Magento 2.2 and it could be a problem with installed extension, but for me there isn't any entry in the log files of Magento, PHP or MySQL.
Best Answer
This is the problem with your cache. Just cleared your magento cache. If you are using any third party cache like Redis, just flush it and try. It will fix this problem.