Let's look into it, seems like the shaders are finding an error and not compiling.
Is the material on your Sprite Renderer doodle's Shadow Casting Sprite?
Can you do the following:
* Go to the Project window
* Right click the Assets folder at the top
* Click Refresh
* Send me the Editor log https://docs.unity.cn/6000.1/Documentation/Manual/log-files.html
feel free to email me too