Retroft post Expected BEGIN_ARRAY but was BEGIN_OBJECT in android [duplicate]

I am using retrofit 2.6. when post a request to my web server it shows error Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $. I have used bellow code..

1. In android i have used to post request like bellow ..

     private void getPosts() {
       String basurl = "http://10.11.201.179:8084/TestWeb/";
   
       Retrofit retrofit = new Retrofit.Builder()
           .baseUrl(basurl)
           .addConverterFactory(GsonConverterFactory.create())
           .build();
   
       JsonPlaceHolderApi jsonPlaceHolderApi = retrofit.create(JsonPlaceHolderApi.class);
      Map<String, String> parameters = new HashMap<>();
      parameters.put("user_id", "12345");
      parameters.put("password", "123");
   
     Call<List<Post>> call = jsonPlaceHolderApi.getPosts(parameters);
   
   
     call.enqueue(new Callback<List<Post>>() {
       @Override
       public void onResponse(Call<List<Post>> call, retrofit2.Response<List<Post>> response) {
           Log.e("response.body", response.toString());
           if (!response.isSuccessful()) {
               // textViewResult.setText("Code: " + response.code());
               return;
           }
   
           Log.e("response.body", response.body().toString());
   
           List<Post> posts = response.body();
   
           for (Post post : posts) {
               Log.e("name", post.getName());
   
               //textViewResult.append(content);
           }
       }
   
       @Override
       public void onFailure(Call<List<Post>> call, Throwable t) {
           Log.e("***errror", t.getMessage());
       }
    });
   
   }
   

2. Here is my interface to post name JsonPlaceHolderApi

   public interface JsonPlaceHolderApi {
     @POST("TestS")
     Call<List<Post>> getPosts(@QueryMap Map<String, String> parameters);
    }
   

3. Here i have bind the response server

   public class Post {
    @SerializedName("mobile")
    @Expose
    public String mobile;
   
   @SerializedName("name")
   @Expose
   public String name;
   
   //Getter serter
   }
   

4. Here is my json

    {
     "name": "1",
     "mobile": "01921687433"
     }
   

Please help me