all my shyader , materials are like this
Can someone help me ?
Usually when the graphics card fails, or the material is to expensive to be running on your PC this can be an issue. I suggest upgrading graphics card or update the drivers for your graphics card in order to resolve the issue.
Is it only the one material that you are showcasing here? Also, the roughness texture is using the wrong compression setting. You can either change the material texture sample or the texture to remove the warning. It should be in linear space, so I think you need to disable the sRGB setting on the texture.