I've just tried to use 2019.3.11b to contuinue working with my project, but I got those errors

In 2019.2.11 everything works well. I just opened the project in 2019.3.11b and got this. What’s the problem?

I removed some of the errors by deleting old HDRP asset, upgrading to new one, creating new one, saving the project and restaring it again.
Old shader-graphs don’t work so you’ll have to remade them.
Try if this will remove some of console errors.

What do you mean by “Old shader-graphs” even those that came from 2019.2.11? Are they old?

My shader-graphs in 6.9.1 did’t work in 7.1.1 anymore so I had to redo them.

But I’ve been using 7.1.1 even in 2019.2.11. And there they work well.

And in 2019.3.11 my camera doesn’t render anything it’s a black screen. Even in the Scene but it’s grey there.

I’ve updated the project to early beta becuase v6.9.1 didn’t have time node preview in the shader editor.

I don’t know about that. Could be imported prefabs so something else.