Fatal error: Uncaught Error: Access to undeclared static property: Mirasvit\Kb\Observer\RegisterUrlRewriteObserver::$isRegistered in /home/brightbrain/public_html/vendor/mirasvit/module-kb/src/Kb/Observer/RegisterUrlRewriteObserver.php:68 Stack trace: #0 /home/brightbrain/public_html/vendor/magento/framework/Event/Invoker/InvokerDefault.php(88): Mirasvit\Kb\Observer\RegisterUrlRewriteObserver->execute(Object(Magento\Framework\Event\Observer)) #1 /home/brightbrain/public_html/vendor/magento/framework/Event/Invoker/InvokerDefault.php(74): Magento\Framework\Event\Invoker\InvokerDefault->_callObserverMethod(Object(Mirasvit\Kb\Observer\RegisterUrlRewriteObserver), Object(Magento\Framework\Event\Observer)) #2 /home/brightbrain/public_html/vendor/magento/framework/Event/Manager.php(66): Magento\Framework\Event\Invoker\InvokerDefault->dispatch(Array, Object(Magento\Framework\Event\Observer)) #3 /home/brightbrain/public_html/generated/code/Magento/Framework/Event/Manager/Proxy.php(95): Magento\Framework\Event\Manager->dispatch('co in /home/brightbrain/public_html/vendor/mirasvit/module-kb/src/Kb/Observer/RegisterUrlRewriteObserver.php on line 68