'No named parameter with the name 'nullOk' error in flutter
After having horrible problems I finished by passing my project into another one. But now It gives me this error after trying to run my program. Which I never see before. And also, I didn't edit these codes because they are libraries.
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.0.3/lib/src/widget/app_bar.dart:147:57: Error: No named parameter with the name 'nullOk'.
final ScaffoldState scaffold = Scaffold.of(context, nullOk: true);
^^^^^^
../../Developer/flutter/packages/flutter/lib/src/material/scaffold.dart:1918:24: Context: Found this candidate, but the arguments don't match.
static ScaffoldState of(BuildContext context) {
^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/components/app_bar.dart:32:57: Error: No named parameter with the name 'nullOk'.
final ScaffoldState scaffold = Scaffold.of(context, nullOk: true);
^^^^^^
../../Developer/flutter/packages/flutter/lib/src/material/scaffold.dart:1918:24: Context: Found this candidate, but the arguments don't match.
static ScaffoldState of(BuildContext context) {
^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/components/text_field.dart:953:32: Error: No named parameter with the name 'nullOk'.
MediaQuery.of(context, nullOk: true)?.navigationMode ??
^^^^^^
../../Developer/flutter/packages/flutter/lib/src/widgets/media_query.dart:818:25: Context: Found this candidate, but the arguments don't match.
static MediaQueryData of(BuildContext context) {
^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/neumorphic/theme.dart:390:52: Error: No named parameter with the name 'nullOk'.
_cupertinoOverrideTheme.resolveFrom(context, nullOk: nullOk),
^^^^^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.0.3/lib/src/widget/app_bar.dart:147:57: Error: No named parameter with the name 'nullOk'.
final ScaffoldState scaffold = Scaffold.of(context, nullOk: true);
^^^^^^
../../Developer/flutter/packages/flutter/lib/src/material/scaffold.dart:1918:24: Context: Found this candidate, but the arguments don't match.
static ScaffoldState of(BuildContext context) {
^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/components/app_bar.dart:32:57: Error: No named parameter with the name 'nullOk'.
final ScaffoldState scaffold = Scaffold.of(context, nullOk: true);
^^^^^^
../../Developer/flutter/packages/flutter/lib/src/material/scaffold.dart:1918:24: Context: Found this candidate, but the arguments don't match.
static ScaffoldState of(BuildContext context) {
^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/components/text_field.dart:953:32: Error: No named parameter with the name 'nullOk'.
MediaQuery.of(context, nullOk: true)?.navigationMode ??
^^^^^^
../../Developer/flutter/packages/flutter/lib/src/widgets/media_query.dart:818:25: Context: Found this candidate, but the arguments don't match.
static MediaQueryData of(BuildContext context) {
^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/neumorphic/theme.dart:390:52: Error: No named parameter with the name 'nullOk'.
_cupertinoOverrideTheme.resolveFrom(context, nullOk: nullOk),
Command PhaseScriptExecution failed with a nonzero exit code
note: Using new build system
note: Building targets in parallel
note: Planning build
note: Constructing build description
Could not build the precompiled application for the device.
^^^^^^
Here's my pubspec.yaml
name: Test
environment:
sdk: ">=2.1.0 <3.0.0"
dependencies:
rflutter_alert: ^1.0.3
flutter:
sdk: flutter
mqtt_client: ^8.0.0
provider: ^4.3.2+2
get_it: ^5.0.1
vibration: ^1.7.2
clay_containers: ^0.2.2
local_auth: ^0.6.2+1
flutter_secure_storage: ^3.3.3
neumorphic: ^0.4.0
shared_preferences: ^0.5.8
flutter_neumorphic: ^3.0.3
cupertino_icons: ^0.1.3
dev_dependencies:
flutter_test:
sdk: flutter
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
# The following section is specific to Flutter.
flutter:
uses-material-design: true
assets:
- images/homestadelogo.png
- images/morning.png
fonts:
- family: OpenSans
fonts:
- asset: fonts/assets/fonts/OpenSans.ttf
- family: myLamp
fonts:
- asset: fonts/assets/fonts/mylamp.ttf
What should I do? If you need more details, just ask me.
Solution 1:[1]
Several nullOk parameters have been removed as part of null safety post-migration. You can read more on the corresponding design doc and its upcoming migration guide.
TL;DR you can try to use .maybeOf(context) instead of .of(context, nullOk: true);
You may have to update your dependencies to make it work.
Solution 2:[2]
After lots of effort, I found a successful answer to remove this error.
If you have added SVG dependency in pubspec.yaml so you have replaced this to
flutter_svg: ^0.20.0-nullsafety.3
Solution 3:[3]
If you are using neumorphic ,
Locate,
home/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.0.3/lib/src/widget/app_bar.dart
Search For,
final ScaffoldState scaffold = Scaffold.maybeOf(context);
try to use,
.maybeOf(context); instead of .of(context, nullOk: true);
Solution 4:[4]
For anyone here, what worked for me was just to update my dependencies and then run flutter clean
Solution 5:[5]
Finally, Solved.
Alter the media_query.dart file, search for : static MediaQueryData of(BuildContext context) function, then modify it to :
static MediaQueryData of(BuildContext context, { bool nullOk = false })
Solution 6:[6]
First, open your pubspec.yaml file.
Click Pub outdated menu at the top right corner. If are using android studio IDE.
After a couple of seconds later you will see a list of the package names with version numbers.
Update all dependencies with the latest version number. Also, you have to update flutter_launcher_icons version under dev_dependencies as well.
Click, Pub get the menu for update.
After successful getting all packages. Run your App.
Still, you may have some errors in older uses codes. For example, use:
Scaffold.of(context)
instead of
Scaffold.of(context, nullOk: true)
Because for null safety nullOk parameters have been removed as part of post-migration.
Note: See proper documentation of uses. https://api.flutter.dev/flutter/material/Scaffold/of.html
Again Run your project and enjoy happy coding. Thanks
Solution 7:[7]
Moving :/Flutter/.pub-cache folder to another place worked for me. I did not delete because it affects other projects maybe. Then I will put it its place again.
Solution 8:[8]
i had a similar problem and found that it was an issue with the dependencies in this case its: flutter_neumorphic neumorphic
you can upgrade them to versions that are null-safety compliant or you can run: flutter clean, incase both dependencies are up to date.
Solution 9:[9]
i Fixed this problem by using
Scaffold.of(context)
Instead of
Scaffold.of(context, nullOk: true)
Sources
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Source: Stack Overflow