Realtime algoritm deactivated

I tried to open an old project made on the 8.5 version into 9.5. When the project is loading I got this message in a yellow field: Realtime algorithm is deactivated… When the project is loaded I can see all tracks but there is no wave ore midi, everything is gone.
Please help

Cubase 9.5 Imac late 2012 (sierra) UR44