I want to use migration tool as described here.
But I get Error: Error when reading 'migrate': No such file or directory
Here my dart version and error
xxx#xxx-:~/Desktop/xxx$ dart --version
Dart VM version: 2.4.0 (Unknown timestamp) on "linux_x64"
xxx#xxx-I:~/Desktop/xxx$ dart migrate
Error: Error when reading 'migrate': No such file or directory
pubspec.yaml
version: 1.0.0+1
environment:
sdk: ">=2.12.0 <3.0.0"
**
First solution :**
dart --version
If the dart sdk version is less than 2.12.0
Then try:
Flutter upgrade --force
or
dart upgrade
If dart migrate still doesn'tt work then jump to the second solution
Second solution :
since dart is already downloaded as part of flutter
Make sure first that it hasn't been downloaded twice
on Mac try :
where dart
on MS windows , check your path in the environment variables.
If there was more than one path for the dart sdk , then this is problem
In my case I had it installed twice
/usr/local/bin/dart
/Users/USER/Documents/flutter/bin/dart
so I removed the first one by (mac os)
rm /usr/local/bin/dart
The moment I did that the issue was fixed.
Try
dart --version
again and you should be having the latest version of dart that comes with flutter and you should be able to run succsfully
dart migrate
Related
I am trying to run the code on below project but has been noticing the error about Dart SK version (See below error).
Tried: pub get on YML file, get dependencies on main.dart file but same error. Any help? I read earlier resolution which says adding the version at YML file but it did not work. I also, installed the 2.17.6 in my machine and configured the Environment variable but no luck. Help please
Project from Github:
git clone https://github.com/flutter/codelabs.git
cd codelabs/boring_to_beautiful/step_01/
Error on Android Studio:
Waiting for another flutter command to release the startup lock...
Running "flutter pub get" in step_01...
The current Dart SDK version is 2.17.1.
Because myartist requires SDK version >=2.17.6 <3.3.0, version solving failed.
pub get failed (1; Because myartist requires SDK version >=2.17.6 <3.3.0, version solving failed.)
Process finished with exit code 1
The pubspec.yml has below
environment:
sdk: ">=2.17.6 <3.3.0"
I want to downgrade my flutter from flutter version 3.0.1 to flutter version 2.10.5.
When i try to run the following command:
$ flutter downgrade 2.10.5
i got the following message instead:
Flutter Downgrade Message
How can i downgrade my flutter version to version that i want?
PS: I'm using OS ubuntu 20.04
Extra reference:
Extra Reference
you can not downgrade to specific version. The downgrade command works only for the version you used just before the upgrade.
Example: If you upgrade from 2.8.1 to 3.0.1, the downgrade command will directly downgrade to 2.8.1
So, a workaround might be to use a Flutter Version Management tool. Using this, you can use any flutter version in any of you projects
The simple way is:
Download the version of Flutter you need and put it in the place where Flutter is installed In this directory you have "flutter" folder.
In Ubuntu, it is usually located in this path: /home/username/development/flutter
To develop the software with the desired version, just change the desired folder name to "flutter".
For example :
flutter --> flutter-3.x.x
flutter-2.x.x ---> flutter
The Stable channel contains the most stable Flutter builds:
https://docs.flutter.dev/development/tools/sdk/releases?tab=linux
I have a project that is developed with Flutter v1.22.6 and was working great, after updating the flutter to v2.0.0 and reading the documentation, I've found out I can use dart migrate --apply-changes to fix issues that are related to flutter upgrade, By running the command I get dozens of errors and the error ends with:
The migration tool didn't start, due to analysis errors.
The following steps might fix your problem:
1. Set the lower SDK constraint (in pubspec.yaml) to a version before 2.12.
2. Run `dart pub get`.
3. Try running `dart migrate` again.
What is the simplest way to migrate the current project to the v2?
The problem is that you have already migrated to a newer version of dart.
You can't migrate your projects from the new version, there is literally nothing to migrate to.
If you want to migrate your older projects (which are without null safety) to a new version, your dart version must be older than 2.12.0 version.
In this case, consider changing the version in your pubspec.yaml file.
environment:
sdk: '>=2.11.0 <3.0.0'
Then run the command in your terminal
> dart migrate --apply-changes
make sure you have following step by step migrate dart 2
and base on your error notification try to set in pubspec.yaml
environment:
# Works in Dart 2 only.
sdk: '>=2.0.0 <3.0.0'
When I am running any command that uses dart the response is always as follows;
building flutter tool...
Running Pub upgrade...
The current Dart SDK version is 2.10.0-0.0.dev.flutter-9dca49e71e.
Because flutter_tools depends on collection >=1.15.0-nnbd <1.15.0-nullsafety.2 which requires SDK version >=2.9.0-18.0 <=2.9.10, version solving failed.
I am not able to switch the version nor the channel as those commands run through the same response.
I tried to uninstall flutter and dart, but I have only gotten back to the same issues.
Any help?
Navigate to where to your flutter install directory e.g. C:\Tools\Flutter and do a git pull.
After that you should be able to run any command, such as flutter --help and the Dart SDK will be on the correct version.
This can be verified by running flutter upgrade
I just needed to update my Path ENV Variable
Using Flutter, I am trying to update my dart dependency 2.6.0 but I get an error
Because *project_name* requires SDK version >=2.6.0 <3.0.0, version solving failed.
pub get failed (1)
exit code 1
I want to use the new features that dart offers, such as Extension Methods. How could I go about upgrading my dependency? I have installed the newest stable version of dart on my computer, but regardless I still get that error.
A couple of things that might help:
From this issue, you can try ensuring that you've updated enviroment in your pubspec.yaml file like so:
environment:
sdk: ">=2.0.0-dev.68.0 <3.0.0"
Another thing that might help is just double checking the steps in this post or on the dart installation page to ensure that you've updated to the latest version correctly.