Flutter remove dialogs in sequence - flutter

Question

I am trying to remove dialogs in a specific sequence but I am getting an following error:
E/flutter (14457): [ERROR:flutter/shell/common/shell.cc(188)] Dart Error: Unhandled exception:
E/flutter (14457): Looking up a deactivated widget's ancestor is unsafe.
E/flutter (14457): At this point the state of the widget's element tree is no longer stable. To safely refer to a widget's ancestor in its dispose() method, save a reference to the ancestor by calling inheritFromWidgetOfExactType() in the widget's didChangeDependencies() method.
Here the sequence:
List item
Open Confirm dialog 1
Close (onPressed) dialog 1
Open Loading dialog 2.
Close (Navigator.of(context).pop())
Open dialog 3 with success message.
Both Dialog 1 and 2 cloese with Navigator.of(context).pop().
How can I fix this?

Answer 1

When you use the function Navigator.of(context).pop(),don't use the context from previous dialog,try to use the page's context。
The reason about Looking up a deactivated widget's ancestor is unsafe is previous dialog is closed,but you use that dialog's context. You can see the source code:
static NavigatorState of(
BuildContext context, {
bool rootNavigator = false,
bool nullOk = false,
}) {
final NavigatorState navigator = rootNavigator
? context.rootAncestorStateOfType(const TypeMatcher<NavigatorState>())
: context.ancestorStateOfType(const TypeMatcher<NavigatorState>());// here check the ancestor state,and throw the error
assert(() {
if (navigator == null && !nullOk) {
throw FlutterError(
'Navigator operation requested with a context that does not include a Navigator.\n'
'The context used to push or pop routes from the Navigator must be that of a '
'widget that is a descendant of a Navigator widget.'
);
}
return true;
}());
return navigator;
}