'Joomla Update Issue: Error: Call to undefined method Joomla\CMS\Document\ErrorDocument::getWebAssetManager()

After updating my joomla website, i can nolonger access the administrator end. i get this error, what should i do?

Error: Call to undefined method Joomla\CMS\Document\ErrorDocument::getWebAssetManager(): Call to undefined method Joomla\CMS\Document\HtmlDocument::getWebAssetManager()

json


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