title: Missing package in gen folder with R in android
body: <p>I have a problem with R in android. I have a project with some packages. I changed the name of one package. I saw that the package with the same name was in "gen" folder. When I changed the name, I cleaned the project and this package disappeared from "gen" folder. Now I have error with </p>
  
  <blockquote>
    <p>R cannot be resolved</p>
  </blockquote>
  
  <p>and in all classes I have errors with R. How I can repair my problem?</p>