In more then 3 projects i tried where pageloader is included in pubspec.yaml error appeared:
here
here
and even here, in official angular example
for example, in official hacker_news_pwa
webdev serve makes error:
webdev could not run for this project.
The `build_runner` version – 1.3.3 – is not within the allowed constraint – >=1.5.0 <2.0.0.
when i fix build_ranner version to 1.5.0 another error appears:
Because build_runner >=1.1.3 depends on build >=1.0.0 <1.2.0 and pageloader >=3.0.0-beta <3.0.1 depends on build ^0.12.7, build_runner >=1.1.3 is incompatible with pageloader >=3.0.0-beta
<3.0.1.
And because pageloader >=3.0.0 depends on build_config ^0.3.1 and build_runner >=1.3.4 depends on build_config >=0.4.0 <0.4.1, build_runner >=1.3.4 is incompatible with pageloader
>=3.0.0-beta.
So, because examples.hacker_news_pwa depends on both pageloader ^3.0.0-beta and build_runner ^1.5.0, version solving failed.
and so on and so forth..... endless errors. why?
When pageloader is removed errors removes too.
Related
flutter run build_runner build - return the following result
Target file "build_runner" not found.
This is supposed to generate model classes from schema, but stuck in the above listed issues.
The issue is with the package dependencies. Executing this flutter pub upgrade --major-versions will solve this issue.
I want to add avtar in my App but not able to do this because of dependency conflict/ required version error. I also trying to override dependency but its still not working. also trying this commands.
Flutter clean
Flutter pub get
But still not working.
ERROR:-
Because no versions of random_avatar match >0.0.7 <0.1.0 and random_avatar 0.0.7 depends on flutter_svg ^1.0.3, random_avatar ^0.0.7 requires flutter_svg ^1.0.3.
And because flutter_html >=2.0.0-nullsafety.1 <3.0.0-alpha.1 depends on flutter_svg >=0.22.0 <1.0.0, random_avatar ^0.0.7 is incompatible with flutter_html >=2.0.0-nullsafety.1 <3.0.0-alpha.1.
So, because seedwill_demo depends on both flutter_html ^2.2.1 and random_avatar ^0.0.7, version solving failed.
pub get failed (1; So, because seedwill_demo depends on both flutter_html ^2.2.1 and random_avatar ^0.0.7, version solving failed.)
I guess You working on Flutter 2, but Flutter 3 is released. On pub, some libraries are default compatible with Flutter 3. In this case, not always newest library is the best option. You must find which library is incompatible. Can You put pubspec.yaml to this post? We need TWO version of pubspec.yaml. Previous (which have no error with pub get) and new, with this new library. If You show them, I try find the best version of library for You.
I had problems that look alike, and somehow managed to eliminate them by upgrading flutter parts (updating or reinstalling). Have you tried following commands?
flutter clean
flutter upgrade
flutter pub upgrade
These were my dependencies in my pubspec.yaml:
dependencies:
...
image_picker: ^0.8.4+2
...
And everything worked fine, but now I added this:
dependencies:
...
image_picker: ^0.8.4+2
...
image_editor_pro: ^1.1.8
And running pub get I have this error:
Because image_editor_pro >=1.1.0 depends on image_picker ^0.7.4 and provauth depends on image_picker ^0.8.4+2, image_editor_pro >=1.1.0 is forbidden.
So, because provauth depends on image_editor_pro ^1.1.8, version solving failed.
pub get failed (1; So, because provauth depends on image_editor_pro ^1.1.8, version solving failed.)
I tried downgrading my version of image_picker but I get a new error:
Cannot open file, path = 'C:\Users\loren\flutter.pub-cache_temp\dir60565baa\test\fixtures\invalid\n_structure_<.>.json' (OS Error: Syntax of the name of the file, of the directory or of volume is not correct (This is my bad translation of the error).
, errno = 123)
pub get failed (66; , errno = 123))
What can I do to solve and use both the dependencies?
You can try to override the dependency so only one version is used for your project. Something like this:
name: your_app
dependencies:
image_picker: ^0.8.4+2
image_editor_pro: ^1.1.8
dependency_overrides:
image_picker: '0.8.4+2' # Use only this version for all the code depended on image picker
But you need to thoroughly tested the library that depends on the overrided dependency to check if it not introducing you a new error.
See https://dart.dev/tools/pub/dependencies#dependency-overrides
Seems like there is a conflict with image_editor_pro because the package is old.
It is better to look for another updated package with null safety, like image_editor 1.0.2, this won't have conflictions with image_picker 0.8.4+1.
And if you are willing to downgrade. ## Downgrading is a pain
You might need to downgrade the other dependencies as well. which might lead to Downgrading the Dart version.
After downgrading execute this command:
flutter clean
Then delete pubspec.lock file.
If a conflict between dependencies occurs, the simplest solution is to remove the version numbers of the two dependencies and then replace them with 'any' without the quotes in front of it. Then run pub get.
Hope you can help
I am using analyser 1.7.1. The latest build_runner build command generates the following error.
flutter packages pub run build_runner build Failed to precompile
build_runner:build_runner:
../../../sdk/flutter/.pub-cache/hosted/pub.dartlang.org/analyzer-1.7.1/lib/src/error/best_practices_verifier.dart:1998:14:
Error: A non-null value must be returned since the return type
'String' doesn't allow null. String get displayString {
The usual flutter clean and pub cache repair commands don't seem to be fixing the problem, and displayString doesn't appear anywhere in my codebase.
There's an issue open 9 days ago. Here's the key part:
Right now, the current state of affairs is that:
package:analyzer 1.7.0 requires package:meta ^1.4.0
package:analyzer 1.7.1 has the same contents as 1.7.0, but requires package:meta ^1.3.0
Flutter stable pins package:meta to 1.3.0
I'm uncertain how we're running into the exceptions above - the two most recent versions of analyzer are pretty explicit about which version of meta they need.
#edlman do you have any dependency_overrides in your pubspec?
you're right, I'm using 3rd party pkgs which depend on meta 1.4.0 so I put it to dependency_overrides to solve the collision. It didn't come to my mind it cause such a problem.
I've changed the override to 1.3.0, it works fine, no problem yet
So I'd suggest checking whether or not there's a dependency_overrides in your pubspec, too.
It's a problem with analyser 1.7.1.
Add
dependency_overrides:
analyzer: 1.7.0
to pubspec.yaml.
There are more details available in raina77ow's answer.
I am playing around with non-nullable types and added this to my analysis_options.yaml:
analyzer:
enable-experiment:
- non-nullable
I have a code-generator that is utilising the nullability extension. Visual Code is fine with my code.
Now, I try to run:
flutter packages pub run build_runner watch
I get this error message:
[SEVERE] Failed to snapshot build script .dart_tool/build/entrypoint/build.dart.
This is likely caused by a misconfigured builder definition.
[SEVERE] xyz.dart:95:7: Error: This requires the 'non-nullable' experiment to be enabled.Try enabling this experiment by adding it to the command line when compiling and running.
How can I pass --enable-experiment:non-nullable to flutter packages pub run?
The same happens if I run:
flutter build ios
I get the error message:
lib/main.dart:61:26: Error: This requires the 'non-nullable' experiment to be enabled.
Try enabling this experiment by adding it to the command line when compiling and running.
So, same question: How can I pass --enable-experiment:non-nullable to flutter build?
This problem was occured for me after upgrading the Flutter.
I solved it by cleaning and upgrading the project dependencies again.
Run the below commands in the root directory of your project:
flutter clean
flutter packages pub upgrade
flutter pub run build_runner build
Also as others said, please make sure your sdk version in the pubspec.yaml is compatible with your flutter sdk version.
For null safety to work,
environment:
sdk: ">=2.12.0 <3.0.0"
should be this version at least.
then run flutter clean
and flutter pub get it will work.
Try
flutter clean
This is worked for me!
Depending on what you're doing, sometimes it's as simple as changing the environment in your pubspec.yaml file to update the lower end, ie change a lower end like
environment:
sdk: ">=2.0.0 <3.0.0"
to
environment:
sdk: ">=2.6.0 <3.0.0"
or
environment:
sdk: ">=2.7.0 <3.0.0"
This has worked for the various things that cause this error (using spread syntax in latest version of flutter and dart will also cause this), but I don't need the older environments.
A simple fix for me was to ensure that the analysis_options.yaml is in
the root folder. In my case, it was in the lib folder and none of the
experimental features worked until I moved the file to the same folder
as pubspec.yaml. Other things that can happen include updates that
make the experimental feature no longer required so updating to the
latest version on the flutter master channel may be useful in addition
to verifying the file location. Haven't been able to get the command line
running with this option, however.
Dart Reference
Example of Analysis Options File