Imported module in Android Studio can't find imported class

Question

I recently downloaded the ViewPagerIndicator library and imported it into android studio. After adding it to my project I get a rendering error \"The following classes could

Answer 1

In my case, I did add in app gradle:

// Nearly deprecated.
compile project(':NameOfTheLibProject')
// Or
implementation project(':NameOfTheLibProject')

but it only works when I change

compileSdkVersion 
minSdkVersion 
targetSdkVersion 

in app and the other modules are the same.