Unhandled exception: AttributeError: 'ConfigPlugin' object has no attribute 'getCmdlineValue'

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The report names only ConfigPlugin.getCmdlineValue and provides no environment, reproduction steps, files, or tests. Start by locating ConfigPlugin and the failing call, then determine how the exception can be reproduced. Done means the reported AttributeError no longer occurs and the affected path has regression coverage.

Written by the indexing model from the issue text.