This message means the content of the source file in the game does not match the expected format. For example, it could be expecting a vorbis file, and end-up having a PCM file in the game. It could be caused by:
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The soundbanks loaded by the game are outdated
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The streamed files loaded by the game are outdated
In both cases, please ensure you rebuild all your content in Wwise, and ensure every asset is deployed correctly in your game.