You need to make the following changes in your settings/settings.ini.php file.
Find in settings "cacheEngine" section and set it's content to for memcached
'cache_global_key' => 'dev_livehelperchat',
'className' => 'erLhcoreClassLhMemcache'
"cache_global_key" should be different across different installs of Live Helper Chat on the same server. For redis set className to 'erLhcoreClassLhRedis'
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