Line 375 of inc/RemoteAPICore.php has:
throw new RemoteException(10, 'The requested page does not exist', 121);
Not sure what that initial 10 is supposed to be there. I think this line should just be:
throw new RemoteException('The requested page does not exist', 121);
otherwise you get a fatal if you hit this condition since the 3rd arg, if present, needs to be an exception object, not an int.