Cocos Creator Empty Game Scene & Failed to execute 'shaderSource' on 'WebGLRenderingContext'

Hello Friends.
I m using cocos creator 2.3.3.
While working with this tool, I have seen very bad situation.
I attached screenshot.

Suddenly it doesnt show anything on tool,
and has error “TypeError: Failed to execute ‘shaderSource’ on WebGLRenderingContext” : parameter 1 is not of type ‘WebGLShader’

Why does this happened?
If anyone knows the reason, I hope him to give me solution.

If you have attached a shader file which has errors to a mataerial this can happen. Sometimes it happes when you edit a shader file. Sometimes it goes away when closed and re-opened the editor but if it persists try to check materials that you’ve used or shaders you modified previously. I think material/shader features are not perfectly stable yet.