Error : Message: assert(class_exists(LoadViewer::class))

[webdesign7]

Sorry , I am new to NextCloud , just did a fresh installation on my local and when I go to http://nextcloud.local/index.php/settings/user

I am getting this error:

Message: assert(class_exists(LoadViewer::class)) in file '/var/www/html/apps/settings/lib/Settings/Personal/ServerDevNotice.php' line 82

Apart from enabling OnlyOffice I havent'd done much within NextCloud

Any ideas ?

[juliusknorr]

Please check that you have a git clone of the viewer app and the app is enabled