Hi Marco,
the problem with your process is that you used sendTask that is not yet supported in jBPM. Due to that BPMN parser is not able to parse given sequence flow that points to element with id:
sid-D433A4A1-572D-4419-BD6C-843D78656228
I made it to run (more precisely to deploy - since your test case does only deploy) by changing that node to userTask.
Cheers,
Maciej