Wordpress LScache Plugin: Activating LiteSpeed Cache on Multisite ? error
Last Updated on: Wed, 15 Apr 2026 00:00:02 New WordPress website ? Multisite activated. (Sub Folder ? htaccess for WordPress 3.0 through 3.4+: https://wordpress.org/support/article/multisite-network-administration/#htaccess-and-mod-rewrite) (Activated and deactivated LiteSpeed Cache without any problems before updating WordPress to Multisite.) Activating LiteSpeed Cache plugin shows up error: There has been a critical error on this website. PHP Debugging shows (when on any page on website): ???????????? Fatal error: Uncaught Error: Undefined constant LiteSpeed COOKIEHASH in /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/src/htaccess.cls.php:528 Stack trace: #0 /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/src/htaccess.cls.php(690): LiteSpeed Htaccess->_generate_rules() #1 /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/src/activation.cls.php(305): LiteSpeed Htaccess->update() #2 /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/src/conf.cls.php(497): LiteSpeed Activation->update_files() #3 /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/src/conf.cls.php(142): LiteSpeed Conf->update_confs() #4 /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/src/conf.cls.php(33): LiteSpeed Conf->_conf_db_init() #5 /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/src/core.cls.php(44): LiteSpeed Conf->init() #6 /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/src/root.cls.php(197): LiteSpeed Core->__construct() #7 /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/litespeed-cache.php(178): LiteSpeed Root::cls() #8 /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/litespeed-cache.php(181): run_litespeed_cache() #9 /home/WEBSITEDOMAIN.com/public_html/wp-settings.php(357): include_once(...) #10 /home/WEBSITEDOMAIN.com/public_html/wp-config.php(96): require_once(...) #11 /home/WEBSITEDOMAIN.com/public_html/wp-load.php(50): require_once(...) #12 /home/WEBSITEDOMAIN.com/public_html/wp-blog-header.php(13): require_once(...) #13 /home/WEBSITEDOMAIN.com/public_html/index.php(17): require(...) #14 main thrown in /home/WEBSITEDOMAIN.com/public_html/wp-content/plugins/litespeed-cache/src/htaccess.cls.php on line 528 Notice: is_embed was called incorrectly. Conditional query tags do not work before the query is run. Before then, they always return false. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.) in /home/WEBSITEDOMAIN.com/public_html/wp-includes/functions.php on line 5663 Notice: is_search was called incorrectly. Conditional query tags do not work before the query is run. Before then, they always return false. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.) in /home/WEBSITEDOMAIN.com/public_html/wp-includes/functions.php on line 5663 ???????????? File permissions for folders are 755 and files are 644. It looks like htaccess has not been updated when activating LiteSpeed Cache. Is the activation of the plugin meant to edit the htaccess file or does this happen by an clicking on an option within LiteSpeed Cache settings? I fixed by renaming the LiteSpeed cache plugin folder and renaming back again. Then LiteSpeedCache plugin worked when I activated. It was able to write into the htaccess file the LiteSpeed Cache settings ok. Maybe a bug but easy fix for anyone with the same issues. I made a mistake regarding the fix. I actually activated the plugin on the subsite .i.e. not Network wide. When I try to Network Activate the LiteSpeed Cache plugin it breaks the website as above. have you tried adding these lines into your wp-config file, specifying where backend and frontend htaccess files live? frontend: defined( LITESPEED_CFG_HTACCESS ) || define( LITESPEED_CFG_HTACCESS , your path on server ) backend: defined( LITESPEED_CFG_HTACCESS_BACKEND ) || define( LITESPEED_CFG_HTACCESS_BACKEND , your path on server ) Hi splaquet Could you tell me where you are getting this code? I have never seen anything like it. Also, there is only one htaccess file ? not sure what you mean by backend and frontend . after reading over your post(s) again, I might have misread. I see that you installed multisite w/ subfolder, BUT? is the MU install in the root /public_html or in a subfolder (eg: /public_html/blog). that wp-config setting (I believe) is more appropriate for subfolder WP installs, when theres an .htaccess file located in /public_html & /public_html/blog. that setting is located at: Litespeed Cache > Toolbox > view .htaccess It is in the root public_html directory. Hi, it is fixed already and will be included in new release for the time being , you can follow this https://github.com/litespeedtech/lscache_wp/commit/4e21423e8080cedca8f6d9e6491d615f98442fbc to edit that file manually Best regards,
LiteCache Rush: Speed comes from using less, not from doing it faster
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