android-async-http 1.4.8,loopj android-async-http error

I downloaded the android-async-http-1.4.8.jar and put it under the app->libs folder. Then add the following code in the MainActivity.

AsyncHttpClient client = new AsyncHttpClient();

client.get("http://www.google.com", new AsyncHttpResponseHandler() {

@Override

public void onStart() {

// called before request is started

}

@Override

public void onSuccess(int statusCode, Header[] headers, byte[] response) {

// called when response HTTP status is "200 OK"

textViewDailyTip.setText(response.toString());

}

@Override

public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {

// called when response HTTP status is "4XX" (eg. 401, 403, 404)

}

@Override

public void onRetry(int retryNo) {

// called when request is retried

}

});

but I got the error.

Error:(50, 9) error: cannot access AsyncHttpClient

bad class file: /Users/user/AndroidStudioProjects/yan.com/Yin/app/libs/android-async-http-1.4.8.jar(com/loopj/android/http/AsyncHttpClient.class)

unable to access file: null

Please remove or make sure it appears in the correct subdirectory of the classpath.