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I have just upgraded from Magento 2.1.9 to 2.2.8.

Redis was previously working fine, however, when I activate it now through my env.php file, I am receiving this error.

Warning: substr() expects parameter 1 to be string, object given in /http/vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php on line 1188","1":"1 substr() called at [vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php:1188]

What could be causing this?

When i comment out the Redis configuration in the env.php file, the site works okay but it will not show any updates.

I have tried rm -rf var/generation var/di and all other normally necessary commands but none of them seem to work.

Thanks.

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Generation directory is no longer in var. There seems to be something wrong with your env configuration or with data already cached in Redis. To configure env correctly use

bin/magento setup:config:set --cache-backend=redis --page-cache=redis

To clear existing redis cache use flushall inside redis-cli

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