Android Studio Rendering Problems : The following classes could not be found

Question

I just update Android Studio, and when I restarted it, the preview window rendering failed, and I was told that

The following classes could not be fo

Answer 1

I have faced this issue when I introduced additional supporting libraries in my project IntelliJ IDEA

So for me "File" -> "Invalidate Caches...", and select "Invalidate and Restart" option to fix this.