Error: Cannot run with sound null safety projects

I’m trying to run a Dart project but I’m getting this error message:

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Error: Cannot run with sound null safety, because the following dependencies
don't support null safety:

 - package:trotter

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My info:

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Flutter is already up to date on channel stable
Flutter 2.10.1 • channel stable • https://github.com/flutter/flutter.git
Framework • revision db747aa133 (9 days ago) • 2022-02-09 13:57:35 -0600
Engine • revision ab46186b24
Tools • Dart 2.16.1 • DevTools 2.9.2

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