Hello,
I download imovie qucik start and install it but when I upgrade to joomla 3.8.5 in admin area then the admin area is blank empty page.

Dear penny23232

your site have error prntscr.com/iinddf

Fatal error: Call to undefined method JAdminCssMenu::addChild() in /home/landmovi/public_html/administrator/modules/mod_sppagebuilder_admin_menu/tmpl/default_enabled.php on line 16

please refer: www.joomshaper.com/forums/joomla-3-8

thanks

I had the same problem. This is only partially resolved. Now I have another error.
404 View not found [name, type, prefix]: languages, html, sppagebuilderView

Dear dutchman

Please send us the domain, admin and ftp account in the Website Information (for Admin Only) box to check directly

thanks

done

Dear dutchman

Please send us the link of this issue to check

thanks