error : <failure>Unknown workitem

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I get this error when my jsp execute wqClient.successful(result):
<failure>Unknown workitem: 527.1:Login</failure>
I' ve found nothing about this, nor I was able to find a resolutive approach.
Please look my jsp and the error log for further details.

If I try to comment out the connection block, I get this:
failure>Invalid data structure: root element name doesn't match task name</failure></failure>

it was a problem in decomposition variables settings.