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After updating from 1.4.8 to 1.4.9, the dashboard appearance went from good to bad. Clicking on any menu item leads to errors such as Call to undefined method Joomla\CMS\Document\HtmlDocument::getWebAssetManager() Call to undefined method Joomla\CMS\Toolbar\Toolbar::addNew() I am hoping these errors can be fixed.

Which Joomla version you are using?

I just figured out that 1.4.9 is made for Joomla 4 so I have switched the site to Joomla 4 and now it is working fine.