I cannot replicate this error. Have you installed 3rd party extensions?

I cannot replicate this error. Have you installed 3rd party extensions?

No.

I have 2 filters but is turn off.
I add some logging.
2021-01-11T08:30:08+00:00 CRITICAL 31.xxx.xxx.xxx error Uncaught Throwable of type BadMethodCallException thrown with message "Undefined method enableasset in class Joomla\CMS\WebAsset\WebAssetManager". Stack trace: #0 /home/xvqmcyxf/public_html/j4/templates/cassiopeia/html/mod_finder/default.php(55): Joomla\CMS\WebAsset\WebAssetManager->__call('enableasset', Array) #1 /home/xvqmcyxf/public_html/j4/modules/mod_finder/mod_finder.php(46): require('/home/xvqmcyxf/...') #2 /home/xvqmcyxf/public_html/j4/libraries/src/Dispatcher/ModuleDispatcher.php(54): include('/home/xvqmcyxf/...') #3 /home/xvqmcyxf/public_html/j4/libraries/src/Dispatcher/ModuleDispatcher.php(57): Joomla\CMS\Dispatcher\ModuleDispatcher::Joomla\CMS\Dispatcher\{closure}('/home/xvqmcyxf/...', NULL) #4 /home/xvqmcyxf/public_html/j4/libraries/src/Helper/ModuleHelper.php(293): Joomla\CMS\Dispatcher\ModuleDispatcher->dispatch() #5 /home/xvqmcyxf/public_html/j4/libraries/src/Helper/ModuleHelper.php(166): Joomla\CMS\Helper\ModuleHelper::renderRawModule(Object(stdClass), Object(Joomla\Registry\Registry), Array) #6 /home/xvqmcyxf/public_html/j4/libraries/src/Document/Renderer/Html/ModuleRenderer.php(97): Joomla\CMS\Helper\ModuleHelper::renderModule(Object(stdClass), Array) #7 /home/xvqmcyxf/public_html/j4/libraries/src/Document/Renderer/Html/ModulesRenderer.php(48): Joomla\CMS\Document\Renderer\Html\ModuleRenderer->render(Object(stdClass), Array, NULL) #8 /home/xvqmcyxf/public_html/j4/libraries/src/Document/HtmlDocument.php(589): Joomla\CMS\Document\Renderer\Html\ModulesRenderer->render('sidebar-right', Array, NULL) #9 /home/xvqmcyxf/public_html/j4/libraries/src/Document/HtmlDocument.php(895): Joomla\CMS\Document\HtmlDocument->getBuffer('modules', 'sidebar-right', Array) #10 /home/xvqmcyxf/public_html/j4/libraries/src/Document/HtmlDocument.php(660): Joomla\CMS\Document\HtmlDocument->_renderTemplate() #11 /home/xvqmcyxf/public_html/j4/libraries/src/Application/CMSApplication.php(1011): Joomla\CMS\Document\HtmlDocument->render(false, Array) #12 /home/xvqmcyxf/public_html/j4/libraries/src/Application/SiteApplication.php(804): Joomla\CMS\Application\CMSApplication->render() #13 /home/xvqmcyxf/public_html/j4/libraries/src/Application/CMSApplication.php(272): Joomla\CMS\Application\SiteApplication->render() #14 /home/xvqmcyxf/public_html/j4/includes/app.php(63): Joomla\CMS\Application\CMSApplication->execute() #15 /home/xvqmcyxf/public_html/j4/index.php(36): require_once('/home/xvqmcyxf/...') #16 {main}
I have this error in b5 update b6. Maybe there is nothing to rely on to upgrade from version to version.

afaik we have no mod_finder 0verride in J4 Cassiopea core.
Your error shows:
Stack trace: #0 /home/xvqmcyxf/public_html/j4/templates/cassiopeia/html/mod_finder/default.php(55)

@infograf768
Yes now working. I tested earlier versions through the beta maybe then I was doing something and forgot about it. And I just overwritten the files and that was left.
OK> Close.
Ps. now. delete all and install clean.