What does the error message "Unsupported operation sort" mean in Flutter Web?

edit

This error message appears when you try to call the sort() method on an object that does not support sorting in Flutter Web. This usually happens when you try to sort an object that is not a list or an iterable. To fix the error, make sure that the object you are trying to sort is a list or an iterable. Alternatively, you can create a new list from the object and then sort the new list.