Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source!
Resolving dependencies...
The lower bound of "sdk: '>=2.7.0 <3.0.0'" must be 2.12.0'
or higher to enable null safety.
The current Dart SDK (3.5.4) only supports null safety.
For details, see https://dart.dev/null-safety
exit code 65
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source!
Resolving dependencies...
The lower bound of "sdk: '>=2.7.0 <3.0.0'" must be 2.12.0'
or higher to enable null safety.
The current Dart SDK (3.5.4) only supports null safety.
For details, see https://dart.dev/null-safety
exit code 65