I have upgrade magneto 2.2.6 to magento 2.3.1 and found "Unable to unserialize value. Error: Syntax error" error during run the php bin/magneto command in terminal

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And browser gets enter image description here

Thanks in advance.


Clearing redis cache redis-cli flushall

This should be part of the steps outlined in the upgrade document
(https://devdocs.magento.com/guides/v2.3/comp-mgr/cli/cli-upgrade.html). The command should be run after composer update and before bin/magento cache:clean

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