What does HRESULT 0xC00D1243 (NS_E_PDA_SYNC_RUNNING) mean?

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It is not possible to perform the requested action because sync is in progress. You can either stop sync or wait for it to complete, and then try again.%0

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NS_E_INCOMPLETE_PLAYLIST	NS_E_PDA_SYNC_LOGIN_ERROR

NS_E_PDA_SYNC_RUNNING

This is a busy-state result, not a failed sync

NS_E_PDA_SYNC_RUNNING (0xC00D1243) means Windows Media Player rejected an action because the sync engine already owns an active synchronization generation. The current sync may be healthy.

Preserve the active operation

Record sync generation/state, active device, queue progress, and the action that was attempted concurrently. Do not stop or delete the current queue before capturing this state.

Correct sequencing

Wait for the active sync to finish, or cancel it through the supported control path if the user intends to stop it. Then issue the requested action again. If cancellation or the running sync itself fails, diagnose that result separately. Treating this HRESULT as a reason to recreate the partnership can turn a simple serialization issue into data loss.

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