Plug-in version doesn't match sound engine version. Please ensure the plug-in is compatible with this version of Wwise.

This error is a symptom of a bad compilation environment or, in Unity, bad integration. This always happen because of a recent Wwise upgrade. Plug-ins of any type (Effect, Source, etc) have a game-side library that needs to be linked with the game code. This error occur when the game-side plug-in code doesn't match the rest of the sound engine library. Note that the game binary could still link properly but not function at runtime.

Probable causes:

There is an old library that was not updated because of file permissions.
In Unity, there is an old DLL/SO/BUNDLE/PRX remaining in the Plugins folder, usually because of file permissions.
In Unity, there is an old DLL/SO/BUNDLE/PRX remaining on the console/mobile, preventing the replacement with the new file.

Recommended resolution steps:

Check the Wwise/SDK/[Platform]/lib folders and validate the libraries are all at the same timestamp.
In Unity, check the Wwise/Plugins/DSP folder and validate the libraries are all at the same timestamp.
Do a clean build of the game.
Clean the deployment folder on the target console/mobile, and redeploy the game.

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