java.lang.IllegalArgumentException: Unable to create converter for ClassA<SubClassB> for method ApiInterface.apiCall

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Unable to create converter for ClassA<SubClassB> for method ApiInterface.apiCall
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java.lang.IllegalArgumentException: Unable to create converter for ClassA<SubClassB> for method ApiInterface.apiCall
at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:720)
at retrofit2.ServiceMethod$Builder.createResponseConverter(ServiceMethod.java:706)
at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:167)
at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:166)
at retrofit2.Retrofit$1.invoke(Retrofit.java:145)
at com.sun.proxy.$Proxy8.apiCall(Unknown Source)
at undefined.TestCall.main(TestCall.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)

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