android app crashed while initiating lopoj AsyncHttpClient in Main activity

Question

I need to get some data from external server in an android app. for that i use

com.loopj.android:android-async-http:1.4.9

But my app crashed while initiating client in MainActivity

private MyClient client;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

   client = new MyCLient();
}

Then, if I run the app, it crashes. except new MyCLient() app is ok.

MyClient.java

package com.example.hellow;

import com.loopj.android.http.*;

 public class MyClient {

private static final String BASE_URL = "https://httpbin.org/";

private static AsyncHttpClient client = new AsyncHttpClient();

public static void get(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
      client.get(getAbsoluteUrl(url), params, responseHandler);
  }

  public static void post(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
      client.post(getAbsoluteUrl(url), params, responseHandler);
  }

  private static String getAbsoluteUrl(String relativeUrl) {
      return BASE_URL + relativeUrl;
  }

}