I'm not sure that this is the same case but I once had a workflow going into "Error '9' when calling service 'SO_OBJECT_SEND" and this was caused by a missing recipient in a notification of completion mail of the task. try checking it.
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I'm not sure that this is the same case but I once had a workflow going into "Error '9' when calling service 'SO_OBJECT_SEND" and this was caused by a missing recipient in a notification of completion mail of the task. try checking it.