Try the following
Change your submit button to use Rules and Custom Code for the Action instead of Submit (or just add a new test button) in the button properties.
Since your mapping connection is named "mapping" you don't need that parameter, so your command can just be:
SubmitToSharePointList /submit=ShpListSubmit
Update the mapping in your form with this one - you can just go to the data tab on the ribbon, select resource files, click Add and overwrite the existing mapping file in the form. In your mapping, you had indicated that there is a repeating group (there is not) but all the individual mappings were not relative paths.
Change those things and let's see where we are. :)