Cubase 12.0.50 Processing Overload?

Just started to record some vocals and this happened, any ideas please.

Processing Overload-01

I have re started Cubase, same error, won’t play the project now, keeps stuttering, tried resetting and changed the Asio Guard to 512 samples

What problems would i get if I opened the same project in Cubase 11, will it be, ok?