java.lang.IllegalArgumentException: RetrofitInterface.getUser: Must have return type or Callback as last argument, not both.

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java.lang.IllegalArgumentException: RetrofitInterface.getUser: Must have return type or Callback as last argument, not both.	at retrofit.RestMethodInfo.methodError(RestMethodInfo.java:107)	at retrofit.RestMethodInfo.parseResponseType(RestMethodInfo.java:267)	at retrofit.RestMethodInfo.(RestMethodInfo.java:97)	at retrofit.RestAdapter.getMethodInfo(RestAdapter.java:213)	at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:236)	at com.sun.proxy.$Proxy0.getUser(Unknown Source)	at com.company.Main.main(Main.java:19)	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:483)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)