I think there is an error in the Quickly tutorial. In the User Dialog section, the tutorial instructs users to enter: title = saver.title_text in the save dialog method. This gives some error which is fixed by using: title = save.title_text()
This is not an error, you just need to add @property to the line above the title_txt method. So, your code should look like this:
This should be placed in the SaveDialog class in the SaveDialog.py file. You can find out about @property and its usage here.