Aquí tienes el hilo que me solucionó el problema.
Android Question - Maven artifact not found...
Hello. I get this message: "Maven artifact not found". I have tried to do it, but I can not make to work https://www.b4x.com/android/forum/threads/maven-artifact-not-found-com-google-auto-value-auto-value-annotations.103181/#content I have copied the m2repository file to the paths that appears...
www.b4x.com
No me acuerdo como o solucioné. Creo que actualizando con el SDK manager.
De todos modos miraré y te cuento