The method getContext() does not exist on Behat\Testwork\Environment\Environment. It seems like you code against a sub-type of Behat\Testwork\Environment\Environment such as Behat\Behat\Context\Envi...lizedContextEnvironment or Behat\Behat\Context\Envi...lizedContextEnvironment.
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation