Okay - so when I type GenerateGuid in the command field and tab out, there is a GUID in your result field. That means qRules is working correctly in your form.
In your SubmitToSharePointList command, remove the /mapping parameter, you don't need it.
SubmitToSharePointList /submit=ShPListSubmit
If you put the Qdabra Rules error node on your form and click the button that executes the command, do you get an error? I think you are going to need to make some changes to submit your people picker data to your list, it appears right now you have the group mapped to Assigned To?