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This error means that you have two attempts to load the PHP memcache extension in your PHP INIs.
One of the is successful, and the other, which is unneeded and is trying to load /usr/lib64/php/modules/memcached.so fails because /usr/lib64/php/modules/memcached.so relies on libmemcached.so.11, which does not exist.
You should:
# grep memcache.so /etc/php* -r
and find where this attempt is done and get rid of it.