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

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java.lang.IllegalArgumentException: IMyClient.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$RestHandler.invoke(RestAdapter.java:236)
at java.lang.reflect.Proxy.invoke(Proxy.java:393)
at undefined.$Proxy15.getUser(Unknown Source)
at client.MyClient.getUser(MyClient.java:111)
at task.UserProfileTask.call(UserProfileTask.java:41)
at task.UserProfileTask.call(UserProfileTask.java:22)
at roboguice.util.SafeAsyncTask$SafeAsyncTaskAndroidCallable.doInBackground(SafeAsyncTask.java:163)
at roboguice.util.AndroidCallableWrapper.doDoInBackgroundThread(AndroidCallableWrapper.java:113)
at roboguice.util.AndroidCallableWrapper.run(AndroidCallableWrapper.java:41)
at roboguice.util.AndroidCallable.run(AndroidCallable.java:20)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
at java.lang.Thread.getStackTrace(Thread.java:580)
at roboguice.util.AndroidCallable.(AndroidCallable.java:12)
at roboguice.util.SafeAsyncTask$SafeAsyncTaskAndroidCallable.(SafeAsyncTask.java:160)
at roboguice.util.SafeAsyncTask.newTask(SafeAsyncTask.java:156)
at roboguice.util.SafeAsyncTask.future(SafeAsyncTask.java:66)
at roboguice.util.SafeAsyncTask.execute(SafeAsyncTask.java:94)
at roboguice.util.SafeAsyncTask.execute(SafeAsyncTask.java:90)
at ui.fragment.AccountFragment.onViewCreated(AccountFragment.java:122)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1127)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1677)
at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:388)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
at roboguice.activity.RoboActionBarActivity.onStart(RoboActionBarActivity.java:106)
at ui.activity.BaseActivity.onStart(BaseActivity.java:270)
at ui.activity.AccountActivity.onStart(AccountActivity.java:60)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1237)
at android.app.Activity.performStart(Activity.java:6253)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)

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