Fatal error: Uncaught exception Less_Exception_Compiler with message .alert-variant is undefined in anonymous-file-10682.less thrown in vendor/oyejorge/less.php/lib/Less/Tree/Mixin/Call.php on line 148
#0 vendor/oyejorge/less.php/lib/Less/Tree/Ruleset.php(147): Less_Tree_Mixin_Call->compile(Object(Less_Environment))
#1 vendor/oyejorge/less.php/lib/Less/Tree/Ruleset.php(88): Less_Tree_Ruleset->EvalMixinCalls(Object(Less_Tree_Ruleset), Object(Less_Environment), 1)
#2 vendor/oyejorge/less.php/lib/Less/Tree/Ruleset.php(94): Less_Tree_Ruleset->compile(Object(Less_Environment))
#3 vendor/oyejorge/less.php/lib/Less/Parser.php(199): Less_Tree_Ruleset->compile(Object(Less_Environment))
#4 system/modules/extassets/classes/vendor/lessphp/lessc.inc.php(111): Less_Parser->getCss()
#5 system/modules/extassets/classes/ExtCssCombiner.php(105): lessc->compile('//\n// Variables...')
#6 system/modules/extassets/classes/ExtCss.php(276): ExtAssets\ExtCssCombiner->getUserCss()
#7 system/modules/extassets/classes/ExtCss.php(235): ExtAssets\ExtCss->parseExtCss(Object(Contao\LayoutModel), Array)
#8 system/modules/core/library/Contao/Controller.php(710): ExtAssets\ExtCss->hookReplaceDynamicScriptTags('...')
#9 system/modules/core/classes/FrontendTemplate.php(102): Contao\Controller::replaceDynamicScriptTags('...')
#10 system/modules/core/pages/PageRegular.php(190): Contao\FrontendTemplate->output(true)
#11 system/modules/core/controllers/FrontendIndex.php(285): Contao\PageRegular->generate(Object(Contao\PageModel), true)
#12 index.php(20): Contao\FrontendIndex->run()
#13 {main}