Flutter pubspec.yaml null sfety error solution

 The lower bound of "sdk: '>=2.5.0 <3.0.0'" must be 2.12.0 or higher to enable null safety.


I resolve this by:


flutter pub upgrade --major-versions


the other 2 code I run erlier is:


flutter pub get


and 


flutter pub get --no example


Which both resulting in error. The code : 


flutter pub upgrade --major-versions


is recommmend by terminal to resolve my issue. and all error on lib folder gone.




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