What does HRESULT 0x80010106 (RPC_E_CHANGED_MODE) mean?

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The current thread was already initialized for COM with an incompatible apartment model.

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RPC_E_SERVERFAULT	RPC_E_INVALIDMETHOD

RPC_E_CHANGED_MODE

RPC_E_CHANGED_MODE means that the current thread was already initialized for COM with a different concurrency model. A thread cannot switch between incompatible apartment models without first being fully uninitialized.

How to correct initialization

Initialize each COM-using thread once with the intended CoInitializeEx flag.
Use the same flag for any subsequent initialization on that thread and balance successful calls with CoUninitialize.
Do not call OleInitialize on a thread already initialized as multithreaded.

Move components that require a different apartment model to a separate thread instead of trying to change the current thread in place.

Microsoft: COM documentation

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