Build error cannot resolve symbol class

#1

so I am trying to make network call using okhttp and from github api to display user data
in a recycler view and thus I made a githubUser class and githubAdapter class.

In mainActivity when I declare arrayList of type githubUser it works fine (ctrl+click takes me to
correct githubUser file) but on Running the app it shows build error:cannot resolve symbol
class githubUser and same is the case for githubAdapter class.

#2

link to my project

#3

Can you upload it on github?
Your link to project shows empty folder.