[已解決][Flutter] This requires the 'non-nullable' language feature to be enabled. Try updating your pubspec.yaml to set the minimum SDK constraint to 2.12.0 or higher, and running 'pub get'.
Last Updated on 2021-10-15 by Clay
這是由於 dart 版本升級之後的程式碼,有部分需要啟用所謂的『空安全』(Null-Safety)才能正常編譯所導致的。
Read More »[已解決][Flutter] This requires the 'non-nullable' language feature to be enabled. Try updating your pubspec.yaml to set the minimum SDK constraint to 2.12.0 or higher, and running 'pub get'.