BerzerkRobots (with an
s) is not a subclass of the
Master class so it will not accept it as the starter class.
BerzerkRobots is currently added as a "level mind" in the 'SkookumDemo" project as is described in the docs - http://skookumscript.com/docs/ue4/quickstart/#mind-actors
Any subclass of
Actor can be added to your level in this fashion and will be created and run at the level start.
Master can also be set as the "Starter
Master mind class" in the project settings which will be run when the scripts for that project are initially started regardless of the level.