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Android Google Play Services Interacting with Your API Write a Retrofit interface

Within your interface, define an activeListings method with a void return type. activeListings should take two parameter

My Code has no errors in the Editor but its failing to pass the Task . Please do Help me

package com.etsy.android.samples.sharesy.api;

import com.etsy.android.samples.sharesy.model.ActiveListings;

import retrofit.Callback;
import retrofit.http.GET;
import retrofit.http.Query;

public interface Api {
    public String activeListings();
    public Object activeListings2(int number);
    public int activeListingsThird(Callback<ActiveListings> callback);