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flutter create .
"Flutter-Instagram-UI-Clone" is not a valid Dart package name. From the [Pubspec format description](https://www.dartlang.org/tools/pub/pubspec.html): **DO** use `lowercase_with_underscores` for package names. Package names should be all lowercase, with underscores to separate words, `just_like_this`. Use only basic Latin letters and Arabic digits: [a-z0-9_]. Also, make sure the name is a valid Dart identifier -- that it doesn't start with digits and isn't a reserved word.
- package 이름 소문자+언더바로 수정 후 rebuild