No IDEA annotations attached to the JDK 1.8 (C:\…), some issues will not be found

Solution

• Close Android Studio
• Go to C:\Users\UserName\.android and rename the build-cache folder to build-cache.bak

• Go to C:\Users\UserName\.AndroidStudio3.2\system and rename these folders

  caches to caches.bak

  compile-server to compile-server.bak

  compiler to compiler.bak

  conversion to conversion.bak

  external_build_system to external_build_system.bak

  frameworks to frameworks.bak

  gradle to gradle.bak

  resource_folder_cache to resource_folder_cache.bak

• Open the Android Studio and open your project again.