retrofit2 java.lang.IllegalArgumentException: Unable to create converter for xxx

java.lang.IllegalArgumentException: Unable to create converter for com.xxx

for method xxxxx

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 java.lang.reflect.Proxy.invoke(Proxy.java:813)

at $Proxy0.getRestList(Unknown Source)

在此基础上，已添加gson转换器。仍然报错！

addConverterFactory(GsonConverterFactory.create(gson));

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看了下实体类，原因是用了alternate有两个键重复了！