'pub get failed. exit code 65. flutter

Everything is ok. every package is working. but the shimmer package not working. this is my implementation.

version: 1.0.0+1
environment:
  sdk: ">=2.12.0 <3.0.0"

dependencies: 
  flutter:
    sdk: flutter
  shimmer:
  cupertino_icons: ^1.0.2 

dev_dependencies:
  flutter_test:
    sdk: flutter 

error:

[shimmer] flutter pub get
Running "flutter pub get" in shimmer...                         
Error on line 26, column 3 of pubspec.yaml: A package may not list itself as a dependency.

   ╷


26 │   shimmer:
   │   ^^^^^^^

   ╵
pub get failed (65;    ╵)
exit code 65


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Source: Stack Overflow

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