I have one error, When I invoke the handleRenderPage method to the async method i got error : model.js:83 Uncaught (in promise) TypeError: this.handleRenderPage is not a function

I use MVC to write todo project and in the model class I send the todo list array with handleRenderPage method and I use downloadTask to got the todo list from the server and send it to the view class this is async function:

  downloadTask = async() => {
    const url = 'http://localhost:9090/download';
    const res = await fetch(url);
    const data = await res.json();
    this.tasksList = data;
    console.log(this.tasksList);
    //down is the method 
    this.handleRenderPage(this.tasksList);
  }

and I invoked this func outside the class :

downloadBtn.addEventListener('click', () => {  
  const model = new Model();
  model.downloadTask();
})

when user click download btn app should render todo list from the server