Title: Critical Errors Taking Down Website
Last modified: October 18, 2021

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# Critical Errors Taking Down Website

 *  [chrishenjum](https://wordpress.org/support/users/chrishenjum/)
 * (@chrishenjum)
 * [4 years, 7 months ago](https://wordpress.org/support/topic/critical-errors-taking-down-website/)
 * Hi,
 * I am running into similar issues to others here in that the plugin is taking 
   down my website. Similar to a couple others, I’m using the Stack WordPress theme,
   hosted by WordPress.
    It is saying there is a critical error.
 * These look like they’re helpful on fixing this, or in figuring out the cause:
   
   [https://github.com/oncletom/wp-less/issues/122](https://github.com/oncletom/wp-less/issues/122)
   similar to [https://wordpress.org/support/topic/version-1-9-compile-error/](https://wordpress.org/support/topic/version-1-9-compile-error/)(
   I tried Kari’s solution at the bottom but it did not work)
 * **Here’s what it spit out:**
 * `Fatal error: Uncaught Error: Class 'WPLessStylesheet' not found in /srv/htdocs/
   wp-content/plugins/wp-less/lib/Plugin.class.php:42 Stack trace: #0 /srv/htdocs/
   wp-content/plugins/wp-less/lib/vendor/plugin-toolkit/BasePlugin.class.php(104):
   WPLessPlugin->__construct(Object(WPLessConfiguration)) #1 /srv/htdocs/wp-content/
   plugins/wp-less/lib/Loader.class.php(23): WPPluginToolkitPlugin::create('WPLess','/
   srv/htdocs/wp-...', 'WPLessPlugin') #2 /srv/htdocs/wp-content/plugins/wp-less/
   bootstrap.php(22): WPLessPluginLoader::load(Object(Closure)) #3 /wordpress/core/
   5.8.1/wp-admin/includes/plugin.php(2286): include_once('/srv/htdocs/wp-...') #
   4 /wordpress/core/5.8.1/wp-admin/plugins.php(191): plugin_sandbox_scrape('wp-
   less/bootstr...') #5 {main} thrown in /srv/htdocs/wp-content/plugins/wp-less/
   lib/Plugin.class.php on line 42`
 * **And,**
 *     ```
       Uncaught Exception: load error: failed to find NANless’ in /srv/htdocs/wp-content/plugins/wp-less/vendor/wikimedia/less.php/lessc.inc.php:144
       Stack trace:
       #0 /srv/htdocs/wp-content/plugins/wp-less/vendor/wikimedia/less.php/lessc.inc.php(242): lessc->compileFile('NANless\xE2\x80\x99')
       #1 /srv/htdocs/wp-content/plugins/wp-less/lib/Compiler.class.php(75): lessc->cachedCompile('NANless\xE2\x80\x99', true)
       #2 /srv/htdocs/wp-content/plugins/wp-less/lib/Plugin.class.php(255): WPLessCompiler->cacheStylesheet(Object(WPLessStylesheet), true)
       #3 /srv/htdocs/wp-content/plugins/wp-less/lib/Plugin.class.php(285): WPLessPlugin->processStylesheet('ebor-theme', false)
       #4 wp-includes/class-wp-hook.php(301): WPLessPlugin->processStylesheets()
       #5 wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array)
       #6 wp-includes/plugin.php(470): WP_Hook->do_action(Array)
       #7 wp-includes/script-loader.php(2083): do_action('wp_enqueue_scri...')
       #8 wp-includes/class-wp-hook.php(303): wp_enqueue_scripts('')
       #9 wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array)
       #10 wp-includes/plugin.php(470): WP_Hook->do_action(Array)
       #11 wp-includes/general-template.php(3015): do_action('wp_head')
       #12 /srv/htdocs/wp-content/themes/stack/header.php(9): wp_head()
       #13 wp-includes/template.php(770): require_once('/srv/htdocs/wp-...')
       #14 wp-includes/template.php(716): load_template('/srv/htdocs/wp-...', true, Array)
       #15 wp-includes/general-template.php(48): locate_template(Array, true, true, Array)
       #16 /srv/htdocs/wp-content/themes/stack/page_no_sidebar.php(3): get_header()
       #17 wp-includes/template-loader.php(106): include('/srv/htdocs/wp-...')
       #18 wp-blog-header.php(19): require_once('/wordpress/core...')
       #19 index.php(17): require('/wordpress/core...')
       #20 {main}
         thrown
       ```
   

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 * Last reply from: [chrishenjum](https://wordpress.org/support/users/chrishenjum/)
 * Last activity: [4 years, 7 months ago](https://wordpress.org/support/topic/critical-errors-taking-down-website/)
 * Status: not resolved