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.

error log.txt (1.63 KB)

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>