class file for android.support.v4.app.Fragment not found

Here is my code and i am getting error that cannot access fragment at line "Ion.with(getApplicationContext())". How to fix?

Button j = findViewById(R.id.btn_get);  j.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {          Ion.with(getApplicationContext())              .load("http://api.icndb.com/joke/random/?limitTo=[nerdy]")              .asJsonObject()              .setCallback(new FutureCallback<JsonObject>() {                  @Override                      public void onCompleted(Exception e, JsonObject result) {                          JsonObject value = result.getAsJsonObject("value");                          String joke  = value.get("joke").toString();                          TextView textView = findViewById(R.id.tv_joke);                          textView.setText(joke);                      }              });      }  });  

https://stackoverflow.com/questions/67410629/class-file-for-android-support-v4-app-fragment-not-found May 06, 2021 at 09:08AM