JavaFx: Unable to bind cell's text property with the underlying data

Question

Have built a simple todo list application with JavaFX

As I add tasks, they will be listed in a ListView, the user should be able to delete the task by right-clicking them and selecting "delete task" - have achieved this by handling the event over cell using the context menu and setOnAction method inside a cell factory.

Since I've used a cell factory explicitly, I understand the default bindings of underlying data and formatting does not hold good. so I tried to bind them manually after reading this article . but I get this error. error message

 vTaskList.setCellFactory(param -> {
        ListCell<Task> cell = new ListCell<>();

        // setting context menu for cell
        ContextMenu menu = new ContextMenu();

        cell.textProperty().bind(cell.itemProperty());

        MenuItem deleteTask = new MenuItem();
        deleteTask.setOnAction(del -> {
            vTaskList.getItems().remove(vTaskList.getSelectionModel().getSelectedIndex());
        });

        deleteTask.setText("Delete Task");
        menu.getItems().add(deleteTask);
        cell.setContextMenu(menu);
        return cell;
    });