title: Android Studio 28.0.1 All Package is not available
body: <p>Long story short. Whenever I start my app and click on the login button it would work but when I try to click on the register button it would crash. So, when I go to my RadioGroup. Class above it. It would say Decompile .class file, bytecode version 52.0(Java 8) and source "Android API 28 platform are not found". When I click on download it would give me an error saying all package is not available for some reason. When I thought I download all of it.</p>
  
  <p>how can I resolve this issue?</p>
  
  <p><a href="https://i.stack.imgur.com/7W6Gh.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7W6Gh.jpg" alt="enter image description here"></a></p>