MacOS Big Sur on VirtualBox

I used this video https://www.youtube.com/watch?v=LNsC2sUk26Y for install MacOS Big Sur on Oracle VM VirtualBox. And i am getting this . How to get over it? Please help me!

https://preview.redd.it/yrmpm1ceh5r61.jpg?width=1494&format=pjpg&auto=webp&s=bd15e9e66b4d0889e11a2ba3c33810f694618a1e