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is not a valid dart package name.

By GutoTroslaGutoTrosla on Mar 08, 2021
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.

Source: dart-lang.github.io

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is not a valid dart package name

By SantinoSantino on Mar 08, 2021
This is documented on the name section of Pubspec Format documentation.

It should be all lowercase, with underscores to separate words, just_like_this. Stick with basic Latin letters and Arabic digits: [a-z0-9_] and ensure that it’s a valid Dart identifier (i.e. doesn’t start with digits and isn’t a reserved word).

Try to pick a name that is clear, terse, and not already in use.

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