Missing Prefab & script cannot be load problem #1

This is Ding
I am using Unity 2017.3.1f1.
I cloned the SprUnitySamples and submodules.
When I open the project with Unity in the first time I update the project files for new Unity versions(mendatory).
Then I open the scene such as RigidBody, start the simulation, no physical calculation is running
And I got This two

I already check the project files, all the scrips are cloned

Maybe we have to use the same version of Unity?

Have you experince such problem?