A failure getting sample data w/ RestApiImpl

[Younghyun Kim]

Hello.

I've been trying to run this great sample project, however, I've been failing with the error I mentioned in the title.
Does anyone know how to fix this?
It looked like the url below won't work anymore.

https://raw.githubusercontent.com/android10/Sample-Data/master/Android-CleanArchitecture/

Thanks in advance.