DDJ-400 Connected but not showing on Mac

I have just updated MacOS Catolina and plugged in my DDJ-400 and it does not work. It was working previously before the update. 

Annoyingly, I have tried to redownload the drivers but it says that the DDJ-400 is not connected (Error ID:0x0E21) when it is. 

Can someone help? It's really annoying!