java.lang.IllegalArgumentException: FormUrlEncoded can only be specified on HTTP methods with request body (e.g., @POST)

If you add @FromUrlEncoded to the top of @GET, you will have java.lang.IllegalArgumentException: FormUrlEncoded can only be specified on HTTP methods with request body (e.g., @POST).

Remove @FormUrlEncoded in your code .

public interface APIService {

   @GET("Event")
   Call<ApiResponseModel> viewEvent();
}