Getting java.lang.IllegalArgumentException: Unable to create converter while trying to dynamiclly ch

[Milos Gojic]

Hello i am having next problem. I open same topic on StackOverflow but no answer and i am in hurry. In my json as response from server i am getting  this kind of json.I am also getting error java.lang.IllegalArgumentException: Unable to create converter for at my call method getInvestmentsInForce()

"registeredInvestments": {
"percentages": {
  "2": 12.02,
  "8": 87.98
},
"registeredInvestmentsData": [// some other json model]

so I don't know how to change these numbers inside percentage. It won't be the same all the type but will change dynamically

My model :

public class InvestmentInForceModel {
    @SerializedName("realEstate")
    private List<InvestmentForceRealEstate> forceRealEstate;
    @SerializedName("registeredInvestments")
   private InvestmentForceRegisteredInvestments registeredInvestments;

and in my InvestmentForceRegisteredInvestments :

public class InvestmentForceRegisteredInvestments {
    @SerializedName("percentages")
    private Map<Integer,PercentagesInvestmentInforce> stringPercentagesInvestmentInforceMap;
   // private PercentagesInvestmentInforce percentagesInvestmentInforce;
    @SerializedName("registeredInvestmentsData")
    private List<RegisteredInvestmentsDataModel> registeredInvestmentsDataModelList;
}

and my PercentagesInvestmentInforce:

public class PercentagesInvestmentInforce {
   private int investmentsType;
}

if there no numbers at all then my public class PercentagesInvestmentInforce  will be empty

and my call

public Observable<InvestmentInForceModel> getInvestmentsInForce(){
    return apiService.getInvestmentsInForce();
}