code: public StringBuilder toMsg(StringBuilder sb,  String attErrJson) throws APIException {
  		return toMsg(sb,errDF.newData().in(TYPE.JSON).load(attErrJson).asObject());
  	}
docs: AT&T Requires a specific Error Format for RESTful Services, which AAF complies with.
  
  This code will create a meaningful string from this format.
  
  @param sb
  @param df
  @param r
  @throws APIException