A client is forbidden to complete a task that is already DONE (i.e. completed or skipped).

Possible Causes and Suggested Actions

If a task is already completed (status = DONE, result = COMPLETED), then a client program does not need to complete it.

If a task is currently skipped (status = DONE, result = SKIPPED), then the client should reopen the task and then complete it.

For more about WAITING, IN_PROGRESS and DONE, see Task Life Cycle,

For more about Task Upload operations, see Task Upload.

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