'invalid deadline 5 at epoch 42020, expected 4' what does this error mean

[de-authority]

This means that you have timed out doing a window post. The reasons for the timeout may be: a problem with your graphics card or not having a graphics card, a transient failure of the miner when accessing storage, such as a poor network when accessing network shared storage, and you need to check these possible reasons to avoid missing a window post next time.
lotus-miner proving check [command options] <deadlineIdx> to check the sector status

note: this discussion is selected from slack qustions

[de-authority]

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