What does HRESULT 0x88980404 (UCEERR_ILLEGALHANDLE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The composition engine received an invalid resource handle.

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UCEERR_MALFORMEDPACKET	UCEERR_HANDLELOOKUPFAILED

UCEERR_ILLEGALHANDLE

UCEERR_ILLEGALHANDLE is a Windows User Composition Engine (UCE) HRESULT. It indicates that a command refers to a composition resource handle that is invalid for the current channel or object state.

What to check for UCEERR_ILLEGALHANDLE

Check object lifetime and do not reuse resources after disposal, shutdown, or dispatcher termination.
Review interop code that passes graphics, window, or composition resources between layers.
Confirm that UI work is performed on the dispatcher that owns the affected objects.

Microsoft guidance for WPF render-thread failures

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