A foreign object cache drop-in was found. To use Redis for object caching, please enable the drop-in.

Overview Recently I got this error message when I updated Redis Object Cache wordpress plugin on my site. As soon as I enabled Redis Object Cache, I got the error message: “There has been a critical error on your website. Please check your site admin email inbox for instructions.” “A foreign object cache drop-in was found. To use Redis for object caching, please enable the drop-in.” You can try to deactivate redis object cache plugin or delete it completely and then re-install it to check if it fixes your issue. Try to Flush Redis Object Cache as well if the wordpress redis object cache plugin allows. If you are using Ubuntu server where you …

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