It has something to do with the two buttons at the top of the Provider View - when I removed those, it previewed. I'm not sure what the issue is - I didn't see anything right off, but it does seem that one of the buttons has the same control ID as a button on another view (which I have done before in forms w/ code, so I'm not sure why that would cause an issue). At any rate, remove those two buttons (not the Submit one, the other two) and try again - if it previews / opens, add the buttons back on and re-add the logic.
As an aside, you'll want to rename your data source fields so they have meaningful names, and you have the same field for answers to question 16 & 18 in the Provider view - not sure if that is intentional or not - forgive the un-asked for advice. :-)