Android Studio 3.5 ERROR: Unable to resolve dependency for ':app@debug/compileClasspath'

If you have it declared as follows in project build.gradle

maven { url "https://jitpack.io" }

try changing to

maven { url "https://www.jitpack.io" }

You must check your internet connection and disabled gradle offline mode in setting after that do : File > Invalidate Cache and restart. And try to sync the app !