Android error during build - "default public constructor with no argument must be declared". What's the cause?

Question

Android studio returned an error during build, even after running Clean, and rebuilding:

A default public constructor with no argument must be declared if a custom constructor is declared.

I could not find a line number, nor a file referenced. I have no idea what causes this, as there's no indication from the build where or what the cause of this is.

Answer 1

If you have a custom constructor like this

public class Doge extends RealmObject {
     public Doge(String name) {
       ... 

Then you must also have a default constructor with no additional parameters.

public Doge() {
    // default values possible since 2.0.2
}