getDeviceTypeLabel() error Visitor.php line 539

Hello,

I upgraded to 2.4.1 but my live view broke.

I uploaded all files 2 times but no result.

http://s29.postimg.org/kdloefk77/Piwik_1.jpg

http://s29.postimg.org/a4t78lw5f/Piwik_2.jpg