Error: The method 'ancestorRenderObjectOfType' isn't defined for the class 'BuildContext'.

[yavuztarhan]

../../../development/flutter/.pub-cache/hosted/pub.dartlang.org/gradient_app_bar-0.1.3/lib/gradient_app_bar.dart:610:20: Error: The method 'ancestorRenderObjectOfType' isn't defined for the class 'BuildContext'.
 - 'BuildContext' is from 'package:flutter/src/widgets/framework.dart' ('../../../development/flutter/packages/flutter/lib/src/widgets/framework.dart').
Try correcting the name to the name of an existing method, or defining a method named 'ancestorRenderObjectOfType'.
    return context.ancestorRenderObjectOfType(const TypeMatcher<RenderSliverFloatingPersistentHeader>());
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^
Command PhaseScriptExecution failed with a nonzero exit code

[yavuztarhan]

https://api.flutter.dev/flutter/widgets/BuildContext/ancestorRenderObjectOfType.html

@deprecated

('Use findAncestorRenderObjectOfType instead. ' 'This feature was deprecated after v1.12.1.')

RenderObject ancestorRenderObjectOfType (
TypeMatcher matcher
)
@deprecated('Use findAncestorRenderObjectOfType instead. ' 'This feature was deprecated after v1.12.1.')
Returns the RenderObject object of the nearest ancestor RenderObjectWidget widget that matches the given TypeMatcher.

This method is deprecated. Please use findAncestorRenderObjectOfType instead.

need to update package

[Alex-A4]

Yeah, looks like the author abandon project

[joostlek]

Well to be honest, I did this project a long time ago. After that I once reinstalled my laptop and I didnt have the SDK installed anymore. But now I do, so I'll probably look into it some time soon I guess

[Moujarkash]

@joostlek I made a pull request to fix the issue, please review it

[Wisdom9596]

You don't need Package for GradientAppBar.
Just use this:
AppBar(
...
//backgroundColor: Colors.blue,
flexibleSpace: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
colors: [
Colors.amber[700],
Colors.grey[800],
...
]
)
)
),

[srvstvnhl]

@yavuztarhan have you resolved the issue?

[srvstvnhl]

Well to be honest, I did this project a long time ago. After that I once reinstalled my laptop and I didnt have the SDK installed anymore. But now I do, so I'll probably look into it some time soon I guess

@joostlek Could you please update the package?