Why is the GPU grayed out? Here is the very elaborate, confusing, even befuddling image which I have selected at the time of this strange error occurring.  https://i.stack.imgur.com/cNjzD.png
You need to allow Blender to use your graphics card.

Go to Edit->Preferences->System and select the card you want to use.
If there’s nothing there, you don’t have a compatible graphics card.
No worries, CPU rendering works too.



Happy Blendering.