missing_
Required library '{0}' is missing.
Description
#
The analyzer produces this diagnostic when either the Dart or Flutter SDK
isn't installed correctly, and, as a result, one of the
dart:
libraries
can't be found.
Common fixes
#Reinstall the Dart or Flutter SDK.
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Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Page last updated on 2025-9-1. View source or report an issue.