MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
This means that the connection information in your
wp-config.php file are incorrect or that the Redis server is unreachable.
If you need help, please read the installation instructions.