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[Solved] AnimationController The named parameter ‘vsync’ isn’t defined

Hello Guys, how are you all? Hope you all are fine. You might face AnimationController The named parameter ‘vsync’ isn’t defined as this error in a flutter. here I come with all possible solutions for this error.

we are providing you all possible solutions to solve this error. let’s start this article without wasting your time.

How AnimationController The named parameter ‘vsync’ isn’t defined Error occurs ?

It was working fine But don’t know somehow AnimationController stopped working because somehow vsync is not a named parameter anymore. I am facing this error at below defined line.

controller = AnimationController(duration: Duration(seconds: 3), vsync: this);

It now shows an error saying:

The named parameter 'vsync' isn't defined.
Try correcting the name to an existing named parameter's name, or defining a named parameter with the name 'vsync'.dartundefined_named_parameter

Also I don’t Found any error in flutter doctor output.

How to solve AnimationController the named parameter ‘vsync’ isn’t defined ?

  1. How to solve AnimationController the named parameter 'vsync' isn't defined ?

    to solve AnimationController the named parameter 'vsync' isn't defined To solve this error just change SDK version in pubspec.yaml file and run flutter pub get in android studio then invalidate the cache and restart, That will solve your error.

  2. AnimationController the named parameter 'vsync' isn't defined

    to solve AnimationController the named parameter 'vsync' isn't defined To solve this error just change SDK version in pubspec.yaml file and run flutter pub get in android studio then invalidate the cache and restart, That will solve your error.

Solution 1

To solve this error just change SDK version in pubspec.yaml file and run flutter pub get in android studio then invalidate the cache and restart, That will solve your error.

  1. in your pubspec.yml
  2. change this to in environment :
  3. sdk: “>=2.8.0 <3.0.0”
  4. flutter pub get
  5. invalidate the cache and restart android studio
  6. That’s It.

This Solution Worked For Me.

Solution 2

A few things that help me with issues like this:

  1. run flutter upgrade
  2. Then run flutter pub get
  3. run flutter clean
  4. restart IDE
  5. change flutter channel
  6. In this case, change the minimum SDK version from 2.7.0 to 2.8.0.

Solution 3

After upgrading flutter.

  1. Restarting the IDE
  2. If necessary, reboot your computer

Solution 4

Here Is Detailed Solution Follow All step to solve this error.

1. Change the SDK version in the pubspec.yaml to 2.8

environment:
sdk: '>=2.8.0 <3.0.0'

2. Run open terminal and run

flutter upgrade

3.  get all the package by running this command.

flutter pub get 

4. After that use this command to clean flutter

flutter clean   

5. Close the IDE (like VS Code, Android Studio) and then reopen it. That’s all!!!

Summery

So it’s all About All possible solutions. Hope this above all solution helped you a lot. Comment below Your thoughts and your queries. Comment Below on your suggestion.

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