| Previous | Next |
| UCEERR_UNCHANGABLE_UPDATE_ATTEMPTED | UCEERR_REMOTINGNOTSUPPORTED |
UCEERR_NO_MULTIPLE_WORKER_THREADS
UCEERR_NO_MULTIPLE_WORKER_THREADS is a Windows User Composition Engine (UCE) HRESULT. It indicates that the requested composition operation cannot use multiple worker threads in the current engine configuration.
What to check
- Keep WPF object access on the dispatcher that owns the object unless the API explicitly supports cross-thread use.
- Remove parallel rendering assumptions from custom interop or background work that feeds the visual tree.
- Use dispatcher scheduling to serialize UI updates when the operation requires a single owner.
Microsoft guidance for WPF render-thread failures
Looking for a different code? Search another status or error code.